Fixed Disqus template check failing

DisqusShortname is not a Param

Author: Dito

layouts/partials/blog_single.html

@@ -82,7 +82,7 @@
                 {{ end }}
             </div>
             {{ end }}
-            {{ if .Site.Params.disqusShortname }}
+            {{ if .Site.DisqusShortname }}
             <br>
             <div class="disqus">
                 {{ template "_internal/disqus.html" . }}