Revert

Lets revert back to semitransparent as some users have issues with
fully transparent during calls on certain devices.
Kill off use off FORCE_LED_WITH_SCREEN_OFF notification flag.

NotificationManager has been fixed to reenable the LED when turning off
the screen.

Change-Id: I1b2f50419ab6bb307f7e73775b9ecfcb92d51c2b