Remove Android flag that sets window to  SHOW_WHEN_LOCKED

Do not set the windowmanager flag on Android that makes the activity
keep screen on even when user locks the devices.
Without this fix the phone will not go into locked mode.
Android fix for wrong screen aspect.

In some cases when resuming the app the first calls to
surfaceCreated/surfaceChanged may be in wrong orientation.
Make sure to set viewport according to the dimension of the screen.
Without this fix viewport may be wrong when resuming, resulting on wrong
aspect on screen.