remove comments associated to pull request from single changesets, it's too confusing.

Left are only ones that are status change so we can indicate where the status of this changeset came from

rhodecode/templates/changeset/changeset_file_comment.html

@@ -117,7 +117,11 b''
 
     %for co in c.comments:
         <div id="comment-tr-${co.comment_id}">
+          ## only render comments that are not from pull request, or from
+          ## pull request and a status change
+          %if not co.pull_request or co.pull_request and co.status_change:
           ${comment_block(co)}
+          %endif
         </div>
     %endfor
 </div>