Revert "There are some Rack middleware take keyword arguments for initializing"

This reverts commit c6ef71ccf2
because this causes "wrong number of arguments (given 2, expected 1) (ArgumentError)" on Ruby 2.5

actionpack/lib/action_dispatch/middleware/stack.rb

@@ -34,8 +34,7 @@ module ActionDispatch
       end
 
       def build(app)
-        options = args.extract_options!
-        klass.new(app, *args, **options, &block)
+        klass.new(app, *args, &block)
       end
 
       def build_instrumented(app)