Ensure dataProvider gets set (fixes #7679)

12 profiles were missing the 'copy_prop' enrichment that copies
provider.name to dataProvider if dataProvider is empty. This commit
also removes GPOMapper.update_data_provider() to prefer the solution
of using the 'copy_prop' enrichment.
Merge pull request #36 from dpla/7679-ensure-dataprovider

Ensure `dataProvider` gets set (fixes #7679)