MDL-18592 mod_choice: deprecate incorrect events

mod/choice/classes/event/answer_submitted.php

@@ -145,4 +145,8 @@ class answer_submitted extends \core\event\base {
 
         return $othermapped;
     }
+
+    public static function is_deprecated() {
+        return true;
+    }
 }

mod/choice/classes/event/answer_updated.php

@@ -147,4 +147,8 @@ class answer_updated extends \core\event\base {
 
         return $othermapped;
     }
+
+    public static function is_deprecated() {
+        return true;
+    }
 }