Fix URL encoding of piwik link.

site/layouts/partials/foot.html

@@ -1,5 +1,5 @@
    </div>
    <script src="/res/script/piwik.js" integrity="sha384-RoQ8Cpwu4POd8t5XVSF1Jl7os8OsXawRKUJARJTlv47YhgBoWqB00TbWf0Z8FUXP"></script>
-   <noscript><p><img src="//a.c5h.io/piwik.php?idsite=1&rec=1" style="border:0;" alt="" /></p></noscript>
+   <noscript><p><img src="//a.c5h.io/piwik.php?idsite=1&amp;rec=1" style="border:0;" alt="" /></p></noscript>
   </body>
 </html>