WhisperPush: change appearence to Holo

Be consistent with Settings look.

Also enabled the action bar label to go back.

Change-Id: I8ceb8950cab9d286056048b0eeb2c3829bdadb9b
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge "WhisperPush: change appearence to Holo" into cm-11.0