Make ContactSelectionActivity useable

This fixes the glaring bugs with ContactSelectionActivity.
It doesn't attempt to unify the ContactSelectionActivity
styling with the search styling in PeopleActivity.

Also fix a FAB RTL issue

Bug: 16164583
Bug: 15596131
Change-Id: I4d5b2cc8c5d20ae5cc2caa3e26550a51acc2d966