Fix typo in color-update JavaScript #281

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	20s
deploy-examples	37s
tests / Load tox environments	6s
tests / py39-test-all (ubuntu-latest)	3m 53s
tests / py310-test-all (ubuntu-latest)	3m 25s
tests / py311-test-all (ubuntu-latest)	3m 29s
tests / py312-test-all (ubuntu-latest)	4m 38s
tests / py312-test-qt (ubuntu-latest)	3m 18s
tests / py312-test-jupyter (ubuntu-latest)	2m 51s
tests / py39-test-all (macos-13)	9m 53s
tests / py310-test-all (macos-latest)	5m 30s
tests / py311-test-all (macos-latest)	4m 49s
tests / py312-test-all (macos-latest)	4m 44s
tests / py312-test-qt (macos-latest)	4m 58s
tests / py39-test-all (windows-latest)	6m 30s
tests / py310-test-all (windows-latest)	6m 16s
tests / py311-test-all (windows-latest)	6m 37s
tests / py312-test-all (windows-latest)	6m 53s
tests / py312-test-qt (windows-latest)	6m 52s
tests / py312-test-jupyter (windows-latest)	5m 40s
	1h 31m 23s

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