Only restorecon_data once for all users.

restorecon_data already iterates across all found users internally,
so we don't need to call it for each UID moved.  In fact, this was a
bug that caused data for the owner to be relabeled when moving apps
back to internal storage.

Bug: 21813384
Change-Id: I5ba76d4f30d129365864c8a25b665f344b99a6b4