Respect gospel of Railties Gods: no on_load with after.

We don't need no stinking `on_load` where we're going! Because
people far wiser than me (@rafaelfranca and @jeremy) know that
passing `:after` means the lib is already loaded.

actionview/lib/action_view/railtie.rb

@@ -38,9 +38,7 @@ class Railtie < Rails::Railtie # :nodoc:
     end
 
     initializer "action_view.collection_caching", after: "action_controller.set_configs" do |app|
-      ActiveSupport.on_load(:action_controller) do
-        PartialRenderer.collection_cache = app.config.action_controller.cache_store
-      end
+      PartialRenderer.collection_cache = app.config.action_controller.cache_store
     end
 
     initializer "action_view.per_request_digest_cache" do |app|