SysUI: Fix hiding sensitive notification behavior

This should resolve the issue where sensitive notifications continue
to hide sensitive information even when unlocked.

Per app hiding of sensitive notificiations should continue to work
as well as hiding sensitive information when locked and that setting
is enabled.

Change-Id: Ib19f0709941714df6c337a7b11523d71b37c5ca2
TICKET: CYNGNOS-2176
(cherry picked from commit 23e27fcc)