Fix Appearance.setColorScheme(null) not resetting color scheme value

[sangonz193]

Summary:

Fixes #47725

Calling Appearance.setColorScheme(null) or Appearance.setColorScheme(undefined) no longer resets the color scheme useColorScheme returns like on previous rn versions.

Changelog:

[GENERAL] [FIXED] - Fix Appearance.setColorScheme(null) not resetting color scheme value

Test Plan:

Repo with a patch ready to test: https://github.com/sangonz193/react-native-color-scheme-patch

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[cipolleschi]

Thanks for the fix!

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@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cipolleschi merged this pull request in 7d63235.

[react-native-bot]

This pull request was successfully merged by @sangonz193 in 7d63235

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