Close session for search

Make search non-blocking.

search/ajax/search.php

@@ -23,6 +23,7 @@
 
 // Check if we are a user
 OC_JSON::checkLoggedIn();
+\OC::$server->getSession()->close();
 
 $query=(isset($_GET['query']))?$_GET['query']:'';
 if($query) {