Revert "Settings: move keyguard wallpaper to system (2/2)"

This reverts commit 62de03db5f18054608ee923abf3f95936ae5d398.

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

Change-Id: Ia67223da01e93ed21c8753ff0f521ba4e22f3d8a