Make sure mFullScreenScale is non-zero before animating.

If the led flash is already on when opening up the application
the background would be all black instead of blue since the value
of mFullScreenScale is at the default value of 0.

Change-Id: Id9dd00d93728c9043ee9a897ab143560c0908f60
torch: toggle on/off once

Change-Id: I16c2923912fbc459b6761a9a0d80f5bbea3aaf39
Merge "Make sure mFullScreenScale is non-zero before animating." into cm-11.0
Merge "torch: toggle on/off once" into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Torch into cm-11.0