MDL-31830 course: management interface fixes as noted

* Fixed the highlighing of the default category when no categories have been selected.
* Fixed the bug preventing the action menu for AJAX loaded categories from functioning.
* Repositioned course idnumber infront of course actions.
* Fixed display of moveup on first item and movedown on last item (courses and categories)
* Fixed up resort selected categories string.

theme/bootstrapbase/less/moodle/course.less

@@ -806,6 +806,10 @@ span.editinstructions {
                 }
             }
         }
+        &:first-child > div .item-actions .action-moveup,
+        &:last-child > div .item-actions .action-movedown {
+            display: none;
+        }
     }
 
     #course-listing {