Fix slight screen jank when sliding dialpad upwards

Apply the translation animation to mSearchAndRemoveViewContainer
(which houses the entire searchbox and its margins), so that the
translation takes into account the entire height of the searchbox
as well as its margins.

Also refactored hideSearchBar slightly to remove an unused codepath.

Bug: 13284310

Change-Id: I7b8873154059f616d8a52c4a0239ea6be89c8efc
(cherry picked from commit 94f49046)