Reset lock pattern stealth mode when keygueard pattern view is reset

Stealth mode is not guaranteed to remain constant through keyguard pattern
view lifetime (it's user specific, and user context may be switched), so
update it when keyguard pattern is reset.

BUG=25017442

Change-Id: I798fe685cfaadd35462f54ab7e4fa9e6f6276436
1 file changed