installation: fix for BibWorkflow table dropping
installation: fix for BibWorkflow table dropping

* Adds new BibWorkflow tables to `tabdrop.sql` in case this method
  of dropping tables is still used by some scripts.  (see #1283)

Signed-off-by: Tibor Simko <c7116e45300b163846dc01f3ed02116e3f8ef7a5@cern.ch>

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio