Fix up expanded desktop behaviour.

The expanded desktop mode had a number of issues:
- It didn't handle multi-user scenarios correctly
- In the keyguard, the status bar was shown while the navigation bar was
  hidden, which was inconsistent to the !keyguard case
- Live wallpaper sizing was incorrect when expanded desktop mode was
  enabled due wallpaper windows not being recalculated correctly after
  enabling expanded desktop

This patch should fix all of those items.

Change-Id: I976ffae3a56d411b00026f86b16efa9743a23293
Fix Tablet UI Mode FC

Users: Note that the UI Mode settings in the XYSettings is un-usable atm, the settings will be remove once i got the time to do it. Secondly, tablet interface ui and yadda yadda will be available in the Hybrid Settings. Enjoy

Credits to BeerGang.
Some drawable changes