BibFormat: fix app contenxt issue in bibreformat
BibFormat: fix app contenxt issue in bibreformat

* Fixes an app context issue in bibreformat CLI program.

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

tiborsimko/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base,inveniosoftware/invenio-base