Don't use tag helper in layout (#11704).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10237 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/layouts/base.html.erb

@@ -49,7 +49,7 @@
     <% end %>
 </div>
 
-<%= tag('div', {:id => 'main', :class => (sidebar_content? ? '' : 'nosidebar')}, true) %>
+<div id="main" class="<%= sidebar_content? ? '' : 'nosidebar' %>">
     <div id="sidebar">
         <%= yield :sidebar %>
         <%= view_layouts_base_sidebar_hook_response %>