Adjust global role mapping for delete objects permission.
Adjust `Delete objects` permission for repositories.

With the previous changes on the rolemap.xml the `Delete objects` permission
is not longer avaiable for Administrators. But the Administrator should be
allowed to remove repositoryfolders. Therefore we extend also control the
`Delete objects` Permission in the repository workflow.
Revoke delete permissions for dossiers

This is necessary because the repository workflow has changed so that the
Administrator role has newly the `Delete objects` permission.
Therefore aquiring the `Delete objects` permission is no longer possible.