Fix visual glitch when no contacts/groups

Some text and buttons are briefly visible at the edges of the screen
as they animate under a foreground view.  The fix is to hide them while
the foreground ("no contacts"/"no groups") view is visible.

Bug: 5388255
Change-Id: I0a47af8acfbe48b92bc801ce3c9b7499f7e31c96
1 file changed