Revert "Fix Dispatch.new so passenger works" as it broke the build

This reverts commit c97c31b0.

actionpack/lib/action_controller/dispatch/dispatcher.rb

@@ -50,7 +50,7 @@ def define_dispatcher_callbacks(cache_classes)
 
       def new
         # DEPRECATE Rails application fallback
-        Rails.application.new
+        Rails.application
       end
     end
   end