Remove module from parent class

Currently we are requiring the single page notification button module
in all the subclasses inheriting from ContentItemPresenter. We will be adding
more into this module in coming work, so it's a good idea to remove unecessary
coupling now.

app/presenters/content_item_presenter.rb

@@ -1,6 +1,5 @@
 class ContentItemPresenter
   include ContentItem::Withdrawable
-  include ContentItem::SinglePageNotificationButton
   attr_reader :content_item,
               :requested_path,
               :view_context,
@@ -47,6 +46,10 @@ def requesting_a_service_sign_in_page?
     false
   end
 
+  def has_single_page_notifications?
+    false
+  end
+
   def available_translations
     translations = content_item["links"]["available_translations"] || []