fix: pass flattened styles to adjustPadding

[jaulz]

Motivation

If plain styles are passed, they cannot be used to read properties of it.

Test plan

n/a

[callstack-bot]

Hey @jaulz, thank you for your pull request 🤗. The documentation from this branch can be viewed here. Please remember to update Typescript types if you changed API.

[Trancever]

@jaulz What is this PR fixing?

[jaulz]

The issue is that if you pass a style to StyleSheet.create it will generate an id. Hence, you cannot simply pass styles to adjustPaddingFlat:
https://github.com/callstack/react-native-paper/blob/master/src/components/TextInput/TextInputFlat.js#L147-L166

and read them afterwards like this:

react-native-paper/src/components/TextInput/helpers.js

Line 147 in cbfa181

const { paddingTop, paddingBottom } = styles;

On web, this caused an issue which positioned the text input content incorrectly (to close to the label):

[jbinda]

Thanks @jaulz ! I missed broken padding in web.