topic: Remove form_id form form object

include/class.topic.php

@@ -418,7 +418,6 @@ implements TemplateVariable {
         $this->priority_id = $vars['priority_id'] ?: 0;
         $this->status_id = $vars['status_id'] ?: 0;
         $this->sla_id = $vars['sla_id'] ?: 0;
-        $this->form_id = $vars['form_id'] ?: 0;
         $this->page_id = $vars['page_id'] ?: 0;
         $this->isactive = !!$vars['isactive'];
         $this->ispublic = !!$vars['ispublic'];