fix patch from master -> stable migration

cosmogramme/sql/patch/patch_257.php

 <?php
 $adapter = Zend_Registry::get('sql');
 try {
-	$adpater->query('select rang from reservations limit 1');
+	$adapter->query('select rang from reservations limit 1');
 } catch (Exception $e) {
 	$adapter->query('ALTER TABLE reservations ADD COLUMN rang tinyint');
 }