views: remove tag size indicator bars from /tags.

Remove tag size indicator bars. These bars don't play nicely with dark
mode and aren't all that useful to begin with.

app/views/tags/index.html.erb

@@ -12,7 +12,7 @@
       <tbody>
         <% @tags.each do |tag| %>
           <tr>
-            <td style="<%= tag_post_count_style(tag) %>"><%= tag.post_count %></td>
+            <td><%= tag.post_count %></td>
             <td class="category-<%= tag.category %>">
               <%= link_to("?", show_or_new_wiki_pages_path(:title => tag.name)) %>
               <%= link_to(tag.name, posts_path(:tags => tag.name)) %>