table builder: fix various incorrect css classes.

Change calling convention to explicitly indicate whether the attributes
are for the <th> element or the <td> element. Fixes various cases where
the two were mixed up.

* Fix .col-expand classes not being set correctly on the /post_versions,
  /pool_versions, and /notes pages.

* Fix .updater and .updated-at classes not being set correctly on the
  /forum_topics page.

* Fix the name param being ignored (noticeable in the post count field
  on the /tags page).

* Don't pass empty string when column has no name.

app/views/bulk_update_requests/_listing.html.erb

@@ -27,7 +27,7 @@
     <%= link_to "»", bulk_update_requests_path(search: { user_name: request.user.name }) %>
     <div><%= time_ago_in_words_tagged(request.created_at) %></div>
   <% end %>
-  <% t.column "" do |request| %>
+  <% t.column do |request| %>
     <%= link_to "Show", bulk_update_request_path(request) %> |
     <%= render "bulk_update_requests/bur_edit_links", bur: request %>
   <% end %>