fixes MDL-9195 mform->hardFreeze() doesn't remove id attribute of lab…

…el for checkbox

lib/form/checkbox.php

@@ -99,5 +99,19 @@ function onQuickFormEvent($event, $arg, &$caller)
         }
         return true;
     } // end func onQuickFormEvent
+    /**
+     * Slightly different container template when frozen. Don't want to use a label tag
+     * with a for attribute in that case for the element label but instead use a div.
+     * Templates are defined in renderer constructor.
+     *
+     * @return string
+     */
+    function getElementTemplateType(){
+        if ($this->_flagFrozen){
+            return 'static';
+        } else {
+            return 'default';
+        }
+    }
 }
 ?>