api: record update fix
api: record update fix

* FIX Loads all recordext functions registered before
  updating a record via `Record.commit()`.

Signed-off-by: Jan Aage Lavik <8d55e006a1b29770f275a5c59a7341f17f8e69d5@cern.ch>

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