test_dnd: Fixed memory leak. Free item's data on item deletion.
test_dnd: Fixed memory leak. Free item's data on item deletion.

This fixes coverity CID 1193246:  Resource leak  (RESOURCE_LEAK).

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