fix mem leak on multi-user for pie and a few cleanups

consolidated content observers and removed 3 getInts from redoing the layout as well

PS4: fixed my last 2 derps

Change-Id: Id26cfb8db42d4958b18e75ccbc204b9a4158a7ea

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

Change-Id: Id26cfb8db42d4958b18e75ccbc204b9a4158a7ea