SysUI: Make sure LLS is enabled after inflation

We were not checking if mLiveLockScreenEnabled was true in onInflate
which caused live lock screens to be shown, after reboot, even when
the user has disabled the feature.

Change-Id: I62627f593599f8b8b63b166985881fb8f05ccb4a
TICKET: CYNGNOS-1862
(cherry picked from commit e788a3b7)