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/logical/table_builder.rb

@@ -2,12 +2,14 @@ class TableBuilder
   class Column
     attr_reader :attribute, :name, :block, :header_attributes, :body_attributes
 
-    def initialize(attribute = nil, header_attributes=nil, body_attributes=nil, &block)
+    def initialize(attribute = nil, th: {}, td: {}, width: nil, name: nil, &block)
       @attribute = attribute
-      @header_attributes = header_attributes
-      @body_attributes = body_attributes
-      @name = attribute.kind_of?(String) ? attribute : attribute.to_s.titleize
+      @header_attributes = { width: width, **th }
+      @body_attributes = td
       @block = block
+
+      @name = name || attribute
+      @name = @name.to_s.titleize unless @name.kind_of?(String)
     end
 
     def value(item, i, j)