fix array index php warning in discopower template

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1856 44740490-163a-0410-bde0-09ae8108e29a

modules/discopower/templates/disco-tpl.php

@@ -6,7 +6,7 @@ if(!array_key_exists('header', $this->data)) {
 $this->data['header'] = $this->t($this->data['header']);
 $this->data['jquery'] = array('version' => '1.6', 'core' => TRUE, 'ui' => TRUE, 'css' => TRUE);
 
-$this->data['head'] .= '<link rel="stylesheet" media="screen" type="text/css" href="' . SimpleSAML_Module::getModuleUrl('discopower/style.css')  . '" />';
+$this->data['head'] = '<link rel="stylesheet" media="screen" type="text/css" href="' . SimpleSAML_Module::getModuleUrl('discopower/style.css')  . '" />';
 
 $this->data['head'] .= '<script type="text/javascript" src="' . SimpleSAML_Module::getModuleUrl('discopower/js/jquery.livesearch.js')  . '"></script>';
 $this->data['head'] .= '<script type="text/javascript" src="' . SimpleSAML_Module::getModuleUrl('discopower/js/quicksilver.js')  . '"></script>';