forgot a brace

contrib/templates/default/post.mustache

@@ -21,7 +21,7 @@
         {{Date}}
       </span>
     </label>
-    <a onclick="nntpchan_backlink('{{ShortHash}');">No. {{ShortHash}}</a>
+    <a onclick="nntpchan_backlink('{{ShortHash}}');">No. {{ShortHash}}</a>
     {{#OP}}
       <a href="{{PostURL}}">[reply]</a>
     {{/OP}}