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/moderator/post/disapprovals/index.html.erb

@@ -18,7 +18,7 @@
         <%= link_to "post ##{post_disapproval.post_id}", post_path(post_disapproval.post_id) %>
         <%= link_to "»", moderator_post_disapprovals_path(search: params[:search].merge(post_id: post_disapproval.post_id)) %>
       <% end %>
-      <% t.column "Message", nil, {class: "col-expand"} do |post_disapproval| %>
+      <% t.column "Message", td: {class: "col-expand"} do |post_disapproval| %>
         <div class="prose">
           <%= format_text(post_disapproval.message) %>
         </div>