Settings: LockBeforeUnlock the new way (2/2)

Due that aosp removed the whole LockBeforeUnlock controll (show slider
lockscreen before an unsecure internal lockscreen) we must try to find another way
without touching the security system itself. Long guess sort solution, lmao

here it is, next SlimBean feature

ASS->Interface->Lockscreen->Security

cheers

Patchset:
- correct strings

Change-Id: Iec178ab5ab57ac370e935e7fd4b426e83036d2bf