deleteMessage method

Implementation

@override
void deleteMessage(MessageModel message) {
  if(messageStreamController.isClosed) return;
  initialMessageList.remove(message);
  pelletShow.clear();
  // 时间标记从最久开始标
  for(var item in initialMessageList.reversed){
    inflateMessage(item);
  }
  messageStreamController.sink.add(initialMessageList);
}