Fix wrong implementation of NewTypeSettableAttributes

Summary:
The DataObject NewTypeSettableAttributes was implemented
wrong. Maybe some "copy, paste and forgot to adjust" issue ;-)

Reviewers: #forgetit-dev, claus.due

Reviewed By: #forgetit-dev, claus.due

Subscribers: claus.due

Differential Revision: https://phabricator.dkd.de/D406