AO3-6775 Fix it properly

Author: Bilka2

app/models/work.rb

@@ -252,7 +252,7 @@ def new_recipients_have_not_blocked_gift_giver
   def send_deleted_work_notification
     return unless self.posted?
 
-    users = self.pseuds.pluck(:user).uniq
+    users = self.pseuds.includes(:user).collect(&:user).uniq
     return if users.blank?
 
     orphan_account = User.orphan_account