Simplify instance presenter view access (#26046)

app/controllers/about_controller.rb

@@ -5,15 +5,7 @@ class AboutController < ApplicationController
 
   skip_before_action :require_functional!
 
-  before_action :set_instance_presenter
-
   def show
     expires_in(15.seconds, public: true, stale_while_revalidate: 30.seconds, stale_if_error: 1.day) unless user_signed_in?
   end
-
-  private
-
-  def set_instance_presenter
-    @instance_presenter = InstancePresenter.new
-  end
 end