Fixed REST API issue with unpassed user ID.
Fixed REST API issue with unpassed user ID.

The user ID being passed to the MCP when approving transfers via the REST API
was hardcoded. Fixed.

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