Fix undefined gtagua

tarteaucitron.services.js

@@ -823,7 +823,7 @@ tarteaucitron.services.gtag = {
     "name": "Google Analytics (gtag.js)",
     "uri": "https://support.google.com/analytics/answer/6004245",
     "needConsent": true,
-    "cookies": ['_ga', '_gat', '_gid', '__utma', '__utmb', '__utmc', '__utmt', '__utmz', '_gat_gtag_' + tarteaucitron.user.gtagUa.replace(/-/g, '_')],
+    "cookies": ['_ga', '_gat', '_gid', '__utma', '__utmb', '__utmc', '__utmt', '__utmz'],
     "js": function () {
         "use strict";
         window.dataLayer = window.dataLayer || [];