Fix approve transfer API
Fix approve transfer API

refs #6583

MicroServiceChainChoice had been updated to have a foreign key to
MicroServiceChain which can be used directly, instead of fetching the
MicroServiceChain with the correct UUID.  Update approve_transfer for
this change.

artefactual/archivematica,michal-ruzicka/archivematica,sevein/archivematica,artefactual/archivematica,artefactual/archivematica,sevein/archivematica,eckardm/archivematica,artefactual/archivematica,sevein/archivematica,eckardm/archivematica,michal-ruzicka/archivematica,michal-ruzicka/archivematica,michal-ruzicka/archivematica,eckardm/archivematica,sevein/archivematica,eckardm/archivematica