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.

Settings: Move LockBeforeUnlock -> Secure (2/2)

not really needed because it does not touch the security system.
But imo better from consistence so I decided to move it.