Use action_controller_base hook in initializer (#77)

`action_controller` is called if the controller is an instance of `ActionController::Base` or `ActionController::API`.  And, `ActionController::API` don't have `helper_method` method.

Author: Li Ding

lib/inertia_rails/engine.rb

@@ -8,7 +8,7 @@ class Engine < ::Rails::Engine
     end
 
     initializer "inertia_rails.action_controller" do
-      ActiveSupport.on_load(:action_controller) do
+      ActiveSupport.on_load(:action_controller_base) do
         include ::InertiaRails::Controller
       end
     end