Fix: Ensure immersive tile state (on/off) persists after reboot

If immersive mode is enabled, the immersive tile icon should be white,
with the appropriate text "IMMERSIVE" as opposed to grey with text,
"IMMERSIVE OFF".
When rebooting the device, the tile shows "IMMERSIVE OFF" regardless
of if immersive mode is on or off.

Change-Id: Id805fcb6c6fded41e1d3a38e9a1bc46b7a2a7d1e

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