Fix significant whitespace in jeepyb projects.yaml

* modules/openstack_project/templates/review.projects.yaml.erb: The
alphabetization change 3be8e7f8 inadvertently introduced stray
indentation making the file unable to be parsed by the YAML module.
Fix it.

Change-Id: I504b4b635ad481dd9daa8c1e588a9c9bb5bd2305