Convert URI format to not use querystrings for subject areas

src/UNL/Catalog/Subjects.php

@@ -29,7 +29,7 @@ class UNL_Catalog_Subjects extends DB_DataObject
                 break;
             case 'querystring':
             default:
-                return $catalog->uri.'?view=subject&id='.$this->id;
+                return $catalog->uri.'courses/'.$this->id;
         }
     }
 }