fix sabredav for sqlite2

lib/Connector/Sabre/locks.php

@@ -51,7 +51,7 @@ class OC_Connector_Sabre_Locks extends Sabre_DAV_Locks_Backend_Abstract {
 		// NOTE: the following 10 lines or so could be easily replaced by
 		// pure sql. MySQL's non-standard string concatination prevents us
 		// from doing this though.
-		$query = 'SELECT * FROM *PREFIX*locks WHERE userid = ? AND ((created + timeout) > CAST(? AS UNSIGNED INTEGER)) AND ((uri = ?)';
+		$query = 'SELECT * FROM *PREFIX*locks WHERE userid = ? AND (created + timeout) > ? AND ((uri = ?)';
 		$params = array(OC_USER::getUser(),time(),$uri);
 
 		// We need to check locks for every part in the uri.