Remove "Enable widgets" checkbox from Face Unlock settings

It doesn't work anyway as we have a different option to control
widgets' behaviour.

Change-Id: I2f3c2b6f8f638c6c4d9d9c9b3cdb2facfef70039
don't disable lockscreen widgets on low memory devices (2/2)

Change-Id: Iec97a60097075fde973b6928e1f21f3827e0325b

Conflicts:

	src/com/android/settings/cyanogenmod/LockscreenInterface.java