Fixes button partially showing when parent view height is 0

[roshangm1]

Summary

When the parent view that wraps a button has height 0, the button is still shown partially because of the padding given for text inside Button component for iOS. Here is the issue raised for that:
#26421

Probably, we should not hard code these values, rather provide a way to provide custom style ? This is my first PR so not making big change. :D

Changelog

[iOS] [Fixed] - Give margin instead of padding to text in Button component

Test Plan

When using this block of code,

<View style={{height:0}}>
    <Button title="There is an issue"></Button>
</View>

Before:

After:

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[cpojer]

Thanks for the PR! I think this makes sense and I'll merge it. We are planning on moving this component out of the main repo in the future because of the limited stylability.

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@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @roshangm1 in 9caf991.

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