LockscreenPattern : Toggle dots/error pattern visibility (2/2)

Give user ability to hide error pattern / dots.

Patchset 2 : Cleanup commit msg

Change-Id: Ifdd4615c7116f974a0a67079d58a521e84d76367
Merge "LockscreenPattern : Toggle dots/error pattern visibility (2/2)" into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_Settings into HEAD