Fixed minor CORS issue in file manager pwa

web/SystemAO/file_system/file_explorer.html

@@ -4,7 +4,7 @@
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1.0 user-scalable=no">
         <link rel="stylesheet" href="../../script/tocas/tocas.css">
-        <link rel="manifest" href="manifest.json">
+        <link rel="manifest" crossorigin="use-credentials" href="manifest.json">
         <script type="text/javascript" src="../../script/tocas/tocas.js"></script>
         <script type="text/javascript" src="../../script/jquery.min.js"></script>
         <script type="text/javascript" src="../../script/ao_module.js"></script>