[styles] Fix react-hot-loader regression

[oliviertassinari]

I have spent the afternoon/evening trying to migrate to react-jss's createUseStyles instead of us having to maintain the logic.
However, I'm short on time. It will be more challenging than I first thought. There are a couple of problems to solve, but it will worth it. I have benchmarked a x2 boost when using dynamic style functions.

Instead, I'm going with the "quick-win" approach proposed by @theKashey. Thanks! The logic looks simpler.

Closes #15999

I will continue the react-jss effort migration once this is fixed.

[mui-pr-bot]

Details of bundle changes.

Comparing: cddc4cf...fa7c146

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	-0.02%	-0.01%	318,722	318,659	87,596	87,586
@material-ui/core/Paper	-0.09%	-0.04%	68,349	68,286	20,370	20,361
@material-ui/core/Paper.esm	-0.10%	-0.03%	61,642	61,579	19,172	19,166
@material-ui/core/Popper	0.00%	0.00%	28,966	28,966	10,414	10,414
@material-ui/core/Textarea	0.00%	0.00%	5,513	5,513	2,370	2,370
@material-ui/core/TrapFocus	0.00%	0.00%	3,755	3,755	1,581	1,581
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,016	16,016	5,821	5,821
@material-ui/core/useMediaQuery	0.00%	0.00%	2,529	2,529	1,088	1,088
@material-ui/lab	-0.05%	-0.01%	139,044	138,981	42,787	42,781
@material-ui/styles	-0.12%	-0.05%	51,769	51,706	15,344	15,336
@material-ui/system	0.00%	0.00%	14,926	14,926	4,269	4,269
Button	-0.07%	-0.03%	84,337	84,274	25,711	25,703
Modal	0.00%	0.00%	20,343	20,343	6,682	6,682
colorManipulator	0.00%	0.00%	3,904	3,904	1,544	1,544
docs.landing	0.00%	0.00%	55,232	55,232	13,947	13,947
docs.main	-0.01%	-0.00%	650,888	650,827	204,998	204,993
packages/material-ui/build/umd/material-ui.production.min.js	-0.02%	-0.01%	292,119	292,054	83,462	83,452

Generated by 🚫 dangerJS against fa7c146

[theKashey]

The Web have been fixed again ;)

[oliviertassinari]

One day, we will have this leverage, not yet :). @jonschlinkert is fixing the web!