Fix subtab highlight error

Happened when another tab started with the same letters.

Example:
* test
* test_bug (current)

lib/resque/server.rb

@@ -26,6 +26,10 @@ def current_section
         url_path request.path_info.sub('/','').split('/')[0].downcase
       end
 
+      def current_subtab
+        url_path request.path_info.sub('/','').split('/')[0, 2].join('/').downcase
+      end
+
       def current_page
         url_path request.path_info.sub('/','')
       end
@@ -40,7 +44,7 @@ def path_prefix
       end
 
       def class_if_current(path = '')
-        'class="current"' if current_page[0, path.size] == path
+        'class="current"' if [current_section, current_subtab].include?(path)
       end
 
       def tab(name)