nav menu: remove duplicate "More »" link.

Remove a second hidden "More »" link from the nav menu. This was
leftover code first added in f2f524b87 and later reverted in 68161f7b8.

app/views/layouts/_main_links.html.erb

@@ -19,5 +19,5 @@
   <% if CurrentUser.is_moderator? %>
     <%= nav_link_to("Dashboard", moderator_dashboard_path) %>
   <% end %>
-  <%= nav_link_to("More&nbsp;&raquo;".html_safe, site_map_path, :id => "site-map-link") %>
+  <%= nav_link_to("More&nbsp;&raquo;".html_safe, site_map_path) %>
 </menu>

app/views/layouts/_more_links.html.erb

@@ -1,5 +0,0 @@
-<div id="more-links" style="display: none;">
-  <ul>
-    <%= nav_link_to("More &raquo;".html_safe, site_map_path) %>
-  </ul>
-</div>

app/views/layouts/default.html.erb

@@ -101,8 +101,6 @@
       <%= render "layouts/main_links" %>
       <%= yield :secondary_links %>
     </nav>
-
-    <%= render "layouts/more_links" %>
   </header>
 
   <div id="page">