[docs] Fix reset colors crashing app

[eps1lon]

Closes #16749

It wasn't me :)

[mui-pr-bot]

Details of bundle changes.

Comparing: cc47a27...656d4c3

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	327,279	327,279	90,305	90,305
@material-ui/core/Paper	0.00%	0.00%	68,218	68,218	20,410	20,410
@material-ui/core/Paper.esm	0.00%	0.00%	61,994	61,994	19,220	19,220
@material-ui/core/Popper	0.00%	0.00%	28,963	28,963	10,428	10,428
@material-ui/core/Textarea	0.00%	0.00%	5,541	5,541	2,371	2,371
@material-ui/core/TrapFocus	0.00%	0.00%	3,808	3,808	1,600	1,600
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,161	16,161	5,814	5,814
@material-ui/core/useMediaQuery	0.00%	0.00%	3,101	3,101	1,317	1,317
@material-ui/lab	0.00%	0.00%	141,941	141,941	43,685	43,685
@material-ui/styles	0.00%	0.00%	51,628	51,628	15,408	15,408
@material-ui/system	0.00%	0.00%	15,573	15,573	4,439	4,439
Button	0.00%	0.00%	79,805	79,805	24,362	24,362
Modal	0.00%	0.00%	14,643	14,643	5,230	5,230
Portal	0.00%	0.00%	3,484	3,484	1,565	1,565
Rating	0.00%	0.00%	70,558	70,558	22,099	22,099
Slider	0.00%	0.00%	75,332	75,332	23,344	23,344
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	52,093	52,093	13,814	13,814
docs.main	+0.01% 🔺	+0.01% 🔺	604,322	604,388	193,879	193,895
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	301,614	301,614	86,723	86,723
docs: /	0.00%	0.00%	56,000	56,000	-1	-1
docs: /_app	0.00%	0.00%	137,000	137,000	-1	-1
docs: /_error	0.00%	0.00%	2,110	2,110	-1	-1
docs: /blog/2019-developer-survey-results	0.00%	0.00%	13,600	13,600	-1	-1
docs: /blog/april-2019-update	0.00%	0.00%	4,620	4,620	-1	-1
docs: /blog/june-2019-update	0.00%	0.00%	2,200	2,200	-1	-1
docs: /blog/march-2019-update	0.00%	0.00%	3,180	3,180	-1	-1
docs: /blog/material-ui-v4-is-out	0.00%	0.00%	22,600	22,600	-1	-1
docs: /blog/may-2019-update	0.00%	0.00%	2,750	2,750	-1	-1
docs: /components/about-the-lab	0.00%	0.00%	6,370	6,370	-1	-1
docs: /components/app-bar	0.00%	0.00%	135,000	135,000	-1	-1
docs: /components/autocomplete	0.00%	0.00%	291,000	291,000	-1	-1
docs: /components/avatars	0.00%	0.00%	27,000	27,000	-1	-1
docs: /components/badges	0.00%	0.00%	61,500	61,500	-1	-1
docs: /components/bottom-navigation	0.00%	0.00%	26,900	26,900	-1	-1
docs: /components/box	0.00%	0.00%	32,800	32,800	-1	-1
docs: /components/breadcrumbs	0.00%	0.00%	97,400	97,400	-1	-1
docs: /components/buttons	0.00%	0.00%	236,000	236,000	-1	-1
docs: /components/cards	0.00%	0.00%	72,900	72,900	-1	-1
docs: /components/checkboxes	0.00%	0.00%	69,300	69,300	-1	-1
docs: /components/chips	0.00%	0.00%	115,000	115,000	-1	-1
docs: /components/click-away-listener	0.00%	0.00%	13,300	13,300	-1	-1
docs: /components/container	0.00%	0.00%	13,300	13,300	-1	-1
docs: /components/css-baseline	0.00%	0.00%	20,100	20,100	-1	-1
docs: /components/dialogs	0.00%	0.00%	224,000	224,000	-1	-1
docs: /components/dividers	0.00%	0.00%	51,000	51,000	-1	-1
docs: /components/drawers	0.00%	0.00%	229,000	229,000	-1	-1
docs: /components/expansion-panels	0.00%	0.00%	83,700	83,700	-1	-1
docs: /components/grid	0.00%	0.00%	153,000	153,000	-1	-1
docs: /components/grid-list	0.00%	0.00%	57,300	57,300	-1	-1
docs: /components/hidden	0.00%	0.00%	55,100	55,100	-1	-1
docs: /components/icons	0.00%	0.00%	146,000	146,000	-1	-1
docs: /components/links	0.00%	0.00%	50,500	50,500	-1	-1
docs: /components/lists	0.00%	0.00%	157,000	157,000	-1	-1
docs: /components/menus	0.00%	0.00%	89,400	89,400	-1	-1
docs: /components/modal	0.00%	0.00%	37,300	37,300	-1	-1
docs: /components/no-ssr	0.00%	0.00%	15,800	15,800	-1	-1
docs: /components/paper	0.00%	0.00%	9,510	9,510	-1	-1
docs: /components/pickers	0.00%	0.00%	196,000	196,000	-1	-1
docs: /components/popover	0.00%	0.00%	70,100	70,100	-1	-1
docs: /components/popper	0.00%	0.00%	118,000	118,000	-1	-1
docs: /components/portal	0.00%	0.00%	12,100	12,100	-1	-1
docs: /components/progress	0.00%	0.00%	103,000	103,000	-1	-1
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docs: /components/slider	0.00%	0.00%	80,200	80,200	-1	-1
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docs: /components/steppers	0.00%	0.00%	208,000	208,000	-1	-1
docs: /components/switches	0.00%	0.00%	77,900	77,900	-1	-1
docs: /components/tables	0.00%	0.00%	756,000	756,000	-1	-1
docs: /components/tabs	0.00%	0.00%	168,000	168,000	-1	-1
docs: /components/text-fields	0.00%	0.00%	313,000	313,000	-1	-1
docs: /components/textarea-autosize	0.00%	0.00%	9,750	9,750	-1	-1
docs: /components/toggle-button	0.00%	0.00%	22,300	22,300	-1	-1
docs: /components/tooltips	0.00%	0.00%	96,000	96,000	-1	-1
docs: /components/transfer-list	0.00%	0.00%	48,800	48,800	-1	-1
docs: /components/transitions	0.00%	0.00%	58,400	58,400	-1	-1
docs: /components/typography	0.00%	0.00%	39,700	39,700	-1	-1
docs: /components/use-media-query	0.00%	0.00%	60,600	60,600	-1	-1
docs: /customization/breakpoints	0.00%	0.00%	80,500	80,500	-1	-1
docs: /customization/color	0.00%	0.00%	99,900	99,900	-1	-1
docs: /customization/components	0.00%	0.00%	165,000	165,000	-1	-1
docs: /customization/default-theme	0.00%	0.00%	55,500	55,500	-1	-1
docs: /customization/density	0.00%	0.00%	39,700	39,700	-1	-1
docs: /customization/globals	0.00%	0.00%	19,800	19,800	-1	-1
docs: /customization/palette	0.00%	0.00%	57,500	57,500	-1	-1
docs: /customization/spacing	0.00%	0.00%	12,600	12,600	-1	-1
docs: /customization/themes	0.00%	0.00%	62,800	62,800	-1	-1
docs: /customization/typography	0.00%	0.00%	428,000	428,000	-1	-1
docs: /customization/z-index	0.00%	0.00%	9,730	9,730	-1	-1
docs: /discover-more/backers	0.00%	0.00%	6,840	6,840	-1	-1
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Generated by 🚫 dangerJS against 656d4c3

[oliviertassinari]

I have a similar one to fix 🙃, I broke the hydration of the api pages with the leading slash change.