Freeing frame map

FileMap memory is never released until application exit

Release it now as the texture is already loaded and the memory
used for the packed resource can be released.

Change-Id: Id08a1e466337b3a0179684eb6a444e18147ee343
CameraTile: Launch default gallery app when long pressing active camera tile

Currently long pressing this does nothing. It makes sense to launch the default
gallery app from here if a user long presses in order to see pictures that
they've taken from the smaller camera preview.

Change-Id: Iad73a291443eb2a12e1399f24eeeec61ec945bf5