Add spam-training, spam-reviewing rights

Replaced the check for a moderator role in certain spam-training and
-reviewing points. Make sure modhelpers can check, too.

classes/Notice.php

@@ -2472,7 +2472,7 @@ class Notice extends Managed_DataObject
             $author = $this->getProfile();
 
             if ($author->hasRole(Profile_role::SILENCED)) {
-                if (empty($profile) || !$profile->hasRole(Profile_role::MODERATOR)) {
+                if (empty($profile) || !$profile->hasRight(Right::REVIEWSPAM)) {
                     return true;
                 }
             }