add the actual call for piwik

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>

themes/pel/layouts/partials/footer.html

@@ -120,5 +120,9 @@ $(window).load(function() {
 });
 </script>
 
+{{ if .Site.Params.analytics.piwik }}
+	{{ partial "_analytics/piwik.html" . }}
+{{ end }}
+
 </body>
 </html>