Disable usability hints on lockscreen [1/2]

This gets rid of the glowing borders of the widgets and the glowpad

PS : Fixed derp.

Change-Id: Iff6f3a3599ab9b34f1921e35b224d5878285136f

Conflicts:
	res/values/strings.xml
	res/xml/lockscreen_interface_settings.xml
	src/com/android/settings/slim/LockscreenInterface.java