Fix display freeze happening when changing device orientation while

screen is off.

In that case, we inhibited the rotation animation and freezed the screen
directly. When turning on the screen again, we forgot to unfreeze the
screen, though.

How to reproduce issue:
- Start application using orientation sensor (e.g. messaging)
- Put phone to landscape
- Switch off screen
- Put phone to portrait
- Switch on screen
- Result: Some seconds of delay until turning on screen again