Settings: fix confirm pattern crash on rotate

After setting a new lock pattern from settings, going right back into
"Screen lock" screen and rotating the device would cause a crash.

LockPatternView is expecting to have an instance of LockPatternUtils
available to restore its state, which is null.

Change-Id: Ib8ff83623787d431165af88e56d4a84a27340268
Signed-off-by: Roman Birg <roman@cyngn.com>