discopower: Remove unnecessary include of www/_include.php.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2816 44740490-163a-0410-bde0-09ae8108e29a

modules/discopower/www/disco.php

 <?php
 
-require_once('../www/_include.php');
-
 try {
 	$discoHandler = new sspmod_discopower_PowerIdPDisco(array('saml20-idp-remote', 'shib13-idp-remote'), 'poweridpdisco');
 } catch (Exception $exception) {