Revert "Make sure custom lock wallpaper is readable by all."

This reverts commit d3b4327d73a9dfa4f681df6f8d89321f15cc9bde.
Revert "Lock Screen - Add Lockscreen Wallpaper (2/2)"

This reverts commit 431dcf1f1b38554ab9c4d8823c6e1a8c15b28ac6.

Conflicts:
	res/values/cr_strings.xml