correctly set client based on the session

mobile.netbiblio.php

@@ -185,12 +185,16 @@ class NetBiblio extends WebService
         return $user;
     }
 
-    private function CheckSession($login = null, $client = 'website')
+    private function CheckSession($login = null, $client = null)
     {
         if (!isset ($_SESSION["user"]["login"])) {
             return;
         }
 
+        if(!$client) {
+            $client = isset($_SESSION["user"]["client"]) ? $_SESSION["user"]["client"] : 'website';
+        }
+
         if (!$login) {
             $login = $_SESSION["user"]["login"];
         } else if ($_SESSION["user"]["login"] !== $login) {