PicSphere: Hack the hack

cpfind uses ./ instead of the actual image path.
It causes a few troubles on devices not using multiuser,
or simply not having emulated storage. We just hardcode
/sdcard/ for now, and rely on the system backcompat.
This is highly ugly, but it's 2am and I just want this
fixed :)

Change-Id: I1a04a85d86957611c3b787ef877f24fa3d5edcec