fix(Android,Fabric): invalid behaviour of fitToContents sheet detent

[kkafar]

Description

Fixes invalid behaviour of fitToContents sheet detent on Fabric.

The erroneous behaviour has been caused by different order of updates on Fabric relative to Paper.
On Fabric onCreateView (the place where bottom sheet behaviour is created) is called much later,
Because of this the layoutCallback from ScreenContentWrapper fails to set proper sheet height,
as the sheetBehaviour is still null.

Changes

Screen now keeps weak reference to ScreenContentWrapper and queries it when needed during behaviour configuration.

Test code and steps to reproduce

Test1649, chante sheetInitialDetents to fitToContents and see that it now works on Fabric.

Checklist

• Included code example that can be used to test this change
• [-] Ensured that CI passes