search: fix of facet admin interface
search: fix of facet admin interface

* FIX Fixes admin interface for managing facets.  (closes #3333)

Signed-off-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>

inveniosoftware/invenio-search,inveniosoftware/invenio-search,tiborsimko/invenio-search,tiborsimko/invenio-search