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

This reverts commit 49b52cadc2.

actionpack/lib/action_controller/dispatch/dispatcher.rb

@@ -50,7 +50,7 @@ module ActionController
 
       def new
         # DEPRECATE Rails application fallback
-        Rails.application
+        Rails.application.new
       end
     end
   end