Revert "Fix multi-user behaviour for system UI settings (1/2)"

This reverts commit a012186757fb6fe7695e0c21b79fa20cad57b2d2.

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java