Update res/layout/incall_touch_ui.xml

Removing Black Shade which half-blocking Contact Picture face while Incoming Call occured.

SCREENSHOT
Before: http://i.imgur.com/uGqKFVX.jpg http://i.imgur.com/109mw2y.jpg
After: http://i.imgur.com/icuqK4f.jpg http://i.imgur.com/WwUpO6K.jpg http://i.imgur.com/yhao3br.jpg