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/notes/index.html.erb

@@ -10,7 +10,7 @@
         <%= link_to "#{note.id}.#{note.version}", post_path(note.post_id, anchor: "note-#{note.id}") %>
         <%= link_to "»", note_versions_path(search: { note_id: note.id }) %>
       <% end %>
-      <% t.column "Body", class: "col-expand" do |note| %>
+      <% t.column "Body", td: { class: "col-expand" } do |note| %>
         <%= note.body %>
         <% unless note.is_active? %>
           <span class="inactive">(deleted)</span>