Revert: Wrong notification tone played for secondary user sometimes

This reverts commit: 59efb281f246d1dabe70b8a2d8d5cbffdee32c7e
Fix a number of multi-user bugs.

In particular, expanded desktop mode couldn't be enabled for non-primary
users as GlobalActions wrote the setting to the primary user's settings
DB.
Also fix some other cases where we didn't track the settings for
multi-user correctly.

Change-Id: I3bec45cb84903120639c2e85c1d71ec9a491933c

Conflicts:
	policy/src/com/android/internal/policy/impl/GlobalActions.java

Conflicts:
	policy/src/com/android/internal/policy/impl/GlobalActions.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Conflicts:
	policy/src/com/android/internal/policy/impl/GlobalActions.java