Update the data_process_lookups function.
Earlier images are not deleted, but his name was
removed from the list, and it was possible to
access the image by id. Now all unused images
are deleted.
Reviewers: cedric, seoz
Differential Revision: https://phab.enlightenment.org/D309
Signed-off-by: Cedric Bail <cedric.bail@samsung.com>