Add storage selection (2/2)

Change-Id: I364c9fd43c48195248d374e2f441fad2280aa4de
Fix activity stack when restarting the screen nail

We were stacking multiple activities, resulting in the need for multiple
destructions (back key events) when killing the camera app

Change-Id: I7ec61c517d25f7e47baf47fcd1696f987631c344