Merge pull request #1469 from MITx/feature/ichuang/fix-verbose-staff-debug

Fix "staff debug" so it only appears where useful, instead of everywhere

lms/templates/staff_problem_info.html

 ${module_content}
-%if edit_link:
+%if location.category in ['problem','video','html']:
+%  if edit_link:
 <div>
 	<a href="${edit_link}">Edit</a> /
 	<a href="#${element_id}_xqa-modal" onclick="javascript:getlog('${element_id}', {
@@ -74,3 +75,5 @@ category = ${category | h}
         'user': '${user}'
     });
 </script>
+%endif
+