LockScreen Notification : fix FC
- when an expanded notification gets reposted without bigContentView
base: remove gesture background

Change-Id: I76fd3ae6b13c3b2449645beba127cb9557599557
Lockscreen Notification: invisible clearall button when NonClearable notification

Change-Id: Id8ec7037253d735a07a0844c2581b9c5d0834a86