SysUI: Make sure LLS focus is false when unlocking

Ensure mLlsHasFocus is set to false when device is unlocked.  If not
this can cause state issues where LiveLockScreenController thinks
the LLS had focus when the backing service dies or disconnects,
which causes the keyguard to be shown erroneously.

Change-Id: I33cef3990461599a08a5441e88c883c0d0c7c589
TICKET: CYNGNOS-2739
(cherry picked from commit a3cdad2f)