Fix placeholderTextColor color not able to use theme colors

[Wilson-Lim]

Fix the following TextInput's props unable to map color in theme :

• selectionColor
• underlineColorAndroid
• placeholderTextColor

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
dripsy	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2023 9:34am

[nandorojo]

this looks wrong. it won’t support using color keys.