comments: remove helper to render a comment object.

- we always use helper renderer, and for consistency we should stick with that.
It makes refactoring, and general use much harder. DB objects should have least
possible logic inside.

rhodecode/model/db.py

@@ -3096,10 +3096,6 b' class ChangesetComment(Base, BaseModel):'
         return self.get_index_from_version(
             self.pull_request_version_id, versions)
 
-    def render(self, mentions=False):
-        from rhodecode.lib import helpers as h
-        return h.render(self.text, renderer=self.renderer, mentions=mentions)
-
     def __repr__(self):
         if self.comment_id:
             return '<DB:Comment #%s>' % self.comment_id

rhodecode/templates/changeset/changeset_file_comment.mako

@@ -158,7 +158,7 b''
           </div>
       </div>
       <div class="text">
-          ${comment.render(mentions=True)|n}
+          ${h.render(comment.text, renderer=comment.renderer, mentions=True)}
       </div>
 
   </div>