Fix Modal first frame being rendered on top-left corner (#51048)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51048

Fixes https://github.com/facebook/react-native/issues/50442
Closes https://github.com/facebook/react-native/pull/50704

Users reported that Modals on Android are first renderer anchored in 0,0.
That results in them being on the top left corner of the screen for some seconds.

This is happening because the native state of the Modal on Android as width/height set at 0,0 - which we then update in a subsequent callback.

I'm fixing this by making sure we render the Modal the first time with the right screen size - the status bar size

Changelog:
[Android] [Fixed] - Fix Modal first frame being rendered on top-left corner

Reviewed By: javache

Differential Revision: D73948178

fbshipit-source-id: 055c12aa62d70acc1e4c5a2a5c4ea0c5608e22c7