Use optional parameter to set column class

- Fixes the extremely long class name on the post versions view
- Can now use one value instead of having to set th and td
- Added missing column classes on all tables

app/views/note_versions/_listing.html.erb

@@ -1,7 +1,7 @@
 <div id="p-<%= note_versions_listing_type %>-listing">
 
     <%= table_for @note_versions, {class: "striped autofit", width: "100%"} do |t| %>
-      <% t.column %>
+      <% t.column column: "empty" %>
       <% t.column "Post", {width: "5%"} do |note_version| %>
         <%= link_to note_version.post_id, post_path(note_version.post_id) %>
         <% if params.dig(:search, :note_id).present? %>
@@ -31,7 +31,7 @@
         <%= compact_time note_version.updated_at %>
       <% end %>
       <% if note_versions_listing_type == :revert %>
-        <% t.column "", {width: "7%"} do |note_version| %>
+        <% t.column column: "control", width: "7%" do |note_version| %>
           <%= link_to "Revert to", revert_note_path(note_version.note_id, :version_id => note_version.id), :remote => true, :method => :put, :data => {:confirm => "Are you sure you want to revert to this version?"} %>
         <% end %>
       <% end %>