deposit: workflow delete fix
deposit: workflow delete fix

* Fixes issue where deleting a single unpublished deposit object
  could result in other objects being deleted as well.

Signed-off-by: Lars Holm Nielsen <7eaffca9f7cd98839b5821d0d23e09ff764b82cd@cern.ch>

inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit