FIX: Update draft count after creating a post (#13884)

When a post is created, the draft sequence is increased and then older
drafts are automatically executing a raw SQL query. This skipped the
Draft model callbacks and did not update user's draft count.

I fixed another problem related to a raw SQL query from Draft.cleanup!
method.

lib/post_creator.rb

@@ -229,6 +229,7 @@ class PostCreator
       @post.topic.reload
 
       publish
+      UserStat.update_draft_count(@user.id)
 
       track_latest_on_category
       enqueue_jobs unless @opts[:skip_jobs]