(legacy) firewall_nat.php fix add new link

src/www/firewall_nat.php

@@ -420,7 +420,7 @@ $( document ).ready(function() {
                           <span class="glyphicon glyphicon-remove"></span>
                         </a>
 <?php                   endif; ?>
-                        <a href="firewall_nat_edit.php" class="btn btn-default btn-xs" data-toggle="tooltip" data-placement="left" title="<?=gettext("add new rule");?>">
+                        <a href="firewall_nat_edit.php?after=-1" class="btn btn-default btn-xs" data-toggle="tooltip" data-placement="left" title="<?=gettext("add new rule");?>">
                           <span class="glyphicon glyphicon-plus"></span>
                         </a>
   										</td>