FIX: the muted message should be sent after edit (#9593)

Recently, we added feature that we are sending `/muted` to users who muted specific topic just before `/latest` so the client knows to ignore those messages - https://github.com/discourse/discourse/pull/9482

Same `/muted` message should be included when the post is edited

app/models/topic_tracking_state.rb

@@ -72,8 +72,8 @@ class TopicTrackingState
     "/unread/#{user_id}"
   end
 
-  def self.publish_muted(post)
-    user_ids = post.topic.topic_users
+  def self.publish_muted(topic)
+    user_ids = topic.topic_users
       .where(notification_level: NotificationLevels.all[:muted])
       .joins(:user)
       .where("users.last_seen_at > ?", 7.days.ago)
@@ -82,7 +82,7 @@ class TopicTrackingState
       .pluck(:user_id)
     return if user_ids.blank?
     message = {
-      topic_id: post.topic_id,
+      topic_id: topic.id,
       message_type: MUTED_MESSAGE_TYPE,
     }
     MessageBus.publish("/latest", message.as_json, user_ids: user_ids)