fix(bottomsheet): fix window collapse resulting in an update in the a…

[jspizziri]

…nimatedIndex of the bottomsheet

fix #1416

Motivation

As documented in the above issue a window collapse will cause the bottomsheet to recalculate its animatedIndex in certain scenarios. If the window is decreasing in size the user doesn't expect a change or closure of the bottom sheet index.

This behavior can be observed in the following scenarios:

1. Have a bottom sheet position sufficiently close to the bottom of the screen (lets say 100px).
2. On web, with the sheet open to the smallest index, minimize or resize the browser window (this must be a quick action and a sufficient size differential).
3. On native Android with android:windowSoftInputMode="adjustResize" and the sheet open to the smallest index, trigger the keyboard from an input that is NOT inside the sheet, but is outside of it (e.g. a search text box).

[jspizziri]

@gorhom would love your feedback on this one. It doesn't feel super elegant, but it does seem to be getting the job done for me. I imagine someone with more knowledge of the lib might be able to identify something more elegant.