change tripcode part

contrib/templates/default/post.mustache

@@ -25,7 +25,7 @@
     {{#OP}}
       <a href="{{PostURL}}">[reply]</a>
     {{/OP}}
-    <label for="post_{{PostHash}}" class="tripcode" title="signed post">{{{Pubkey}}}</label>
+    <span class="tripcode">{{{Pubkey}}}</span>
   </p>
   <div class="files">
     {{#Attachments}}