make cms users look like staff by default

* so they get the staff view of problems
* does NOT actually set User.is_staff

cms/djangoapps/contentstore/views.py

@@ -215,9 +215,9 @@ def preview_module_system(request, preview_id, descriptor):
         render_template=render_from_lms,
         debug=True,
         replace_urls=replace_urls,
-        # TODO (vshnayder): CMS users won't see staff view unless they are CMS staff.
+        # TODO (vshnayder): All CMS users get staff view by default
         # is that what we want?
-        is_staff=request.user.is_staff
+        is_staff=True,
     )