Fixed Textinput not properly handling padding and paddingVertical in style props (#33564)

Summary:
Fixes https://github.com/facebook/react-native/issues/33562 #21720. Earlier this [`paddingTop`](d5da70e17e/Libraries/Components/TextInput/TextInput.js (L1367)) used to override the  `paddingTop` of `padding` and `paddingVertical` of the style props. Using `Stylesheet.flatten` will solve this problem.

## Changelog

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[iOS] [Fixed] - Fixed paddingTop not being applied when using padding and paddingVertical in multiline textinput

Pull Request resolved: https://github.com/facebook/react-native/pull/33564

Reviewed By: christophpurrer, cortinico

Differential Revision: D36018667

Pulled By: kacieb

fbshipit-source-id: 0af0ed8ea536ec4e813325b1cf93c7cb2481eb07

Libraries/Components/TextInput/TextInput.js

@@ -1233,7 +1233,7 @@ function InternalTextInput(props: Props): React.Node {
 
     const style =
       props.multiline === true
-        ? [styles.multilineInput, props.style]
+        ? StyleSheet.flatten([styles.multilineInput, props.style])
         : props.style;
 
     const useOnChangeSync =