Fix for FAB positioning

Adds extra check to vertical position to ensure it does not exceed top or bottom bounds

Bug: 401445232
Test: atest MenuViewApperanceTest
Test: Drag and release FAB ontop of status bar. It should not be possible for the FAB to come to rest while overlapping the bar.
Flag: EXEMPT small internal change
Change-Id: Ibcb294c5a40e810b61dd9d442d53de4c4c0ccc8c