Fatal error in menu params when there is a fieldset description

$this->escape is not allowed in your class. It generates the following error:
> Fatal error: Using $this when not in object context in /srv/www/htdocs/joomla16/libraries/joomfish/translateparams/xml.php on line 218.
This PR just removes the escape call as a workaround. If the escaping is needed you need to rewrite it.