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: Iab52ec880cf3d64057bf654e1d3c906566022b45