Fix to choose CRT animation

<bool name="config_animateScreenLights">false</bool>

Must be defined now to choose a different CRT animation, else there is no
options inside Settings to change or hide screen-off-animation.

(commit-message updated for Slim)

Conflicts:
	common-overlay/frameworks/base/core/res/res/values/config.xml

Change-Id: I4cb9678681bed95b3e8f1439c9d3ed88c53caa7b