Autotest: anonimize IP on ga on autotest page

Tools/autotest/web/index.html

@@ -54,7 +54,8 @@ Older test results are <a href="history">available here</a>
   function gtag(){dataLayer.push(arguments);}
   gtag('js', new Date());
 
-  gtag('config', 'UA-75650032-5');
+  gtag('config', 'UA-75650032-5', { 'anonymize_ip': true });
+
 </script>