Move back to end of screen on keyguard

* Animate it back into position after user unlocks
* Re-create taskbar on layout direction change so
PropertyHolders are recreated to take into account
new values

Fixes: 199852418
Test: Tested w/ password + pin for gesture + 3 button
Change-Id: Ie7f16f737a8fc12328c05d7628d0e3ae09fc08ca