Disable raw file downloads from Phabricator
Summary: Raw file downloads do not work reliably anymore. We use Github for them.
Test Plan: Only a template file was changed that I also changed in Jenkins for Continuous and Nightly clients.
Reviewers: O1 MITK Reviewer Group I, floca
Reviewed By: O1 MITK Reviewer Group I, floca
Differential Revision: https://phabricator.mitk.org/D297