deposit: fix minor bugs on post processors

* sherpa_romeo_publisher_process() and
  sherpa_romeo_journal_process() were
  receiving an argument "fields" that
  was not being used

 Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
 Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>