Do not update unread count for story messages

ts/models/messages.ts

@@ -2821,8 +2821,10 @@ export class MessageModel extends window.Backbone.Model<MessageAttributesType> {
     window.Whisper.events.trigger('incrementProgress');
     confirm();
 
+    if (!isStory(this.attributes)) {
       conversation.queueJob('updateUnread', () => conversation.updateUnread());
     }
+  }
 
   // This function is called twice - once from handleDataMessage, and then again from
   //    saveAndNotify, a function called at the end of handleDataMessage as a cleanup for