elm_photo: sanitise file path
elm_photo: sanitise file path

Summary:
Resolved FIXME deal with relative path by sanitising file path

Signed-off-by: kabeer khan <kabeer.khan@samsung.com>

Reviewers: stephenmhouston, cedric, seoz, devilhorns

Reviewed By: cedric, seoz, devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1874

FlorentRevest/Elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary