SysUI: Keep sensitive notifications redacted for swipe

If the user has selected to hide private data in notifications and
switches to Swipe without changing the notification redaction, the
notifications should remain redacted until the user changes back
to show all notification content.

Change-Id: Ic0f6e01cf7c09d4f8ed7e8735158a6fc093b8dcc
TICKET: YAM-103
(cherry picked from commit e21c3d2c)