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