Update analytics code

Author: ThomasGravekamp

_layouts/base.html

@@ -15,7 +15,7 @@
         <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}" type="text/css">
         {% if jekyll.environment == "production" %}
         <script type="text/javascript">
-            var _paq = window._paq || [];
+            var _paq = window._paq = window._paq || [];
             _paq.push(['disableCookies']);
             _paq.push(['trackPageView']);
             _paq.push(['enableLinkTracking']);
@@ -24,7 +24,7 @@
                 _paq.push(['setTrackerUrl', u+'matomo.php']);
                 _paq.push(['setSiteId', '1']);
                 var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
-                g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
+                g.type='text/javascript'; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
             })();
         </script>
         {% endif %}