WebSearch: fix SPIRES dadd regression test
WebSearch: fix SPIRES dadd regression test

* Fixes SPIRES dadd regression test after the recent introduction
  of Video collection.

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