Fixed too agressive validation in settings  form
Fixed too agressive validation in settings  form

refs #5475

Validation on new location information being run even when a new
location wasn't selected.  Moved to form clean instead of widget clean,
since widget doesn't know if it should run validation or not.

artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service