[0.76] Fix reset color scheme

[SMYusupov]

Target Branch(es)

0.76

Link to commit or PR to be picked

facebook/react-native#47725 (comment)

Description

This fixes calling Appearance.setColorScheme(null) or Appearance.setColorScheme(undefined) to reset the color scheme to default system scheme, instead of getting null|undefined by useColorScheme or Appearance.getColorScheme()

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[cortinico]

Picked 7d63235086352d8c424d634c7039551f0a5025dc ✅