🐛[BUG] protable toolbar 菜单超过2个，出现闪烁的省略号

### 🐛 bug 描述
protable toolbar 菜单超过2个，出现闪烁的省略号



### © 版本信息

- ProComponents 版本: 2.7.15
- umi 版本
- 浏览器环境
- 开发环境 [e.g. mac OS]

### 🚑 其他信息
下面是官网的demo
https://pro-components.antdigital.dev/components/table?tab=api¤t=1&pageSize=5#toolbar-%E8%87%AA%E5%AE%9A%E4%B9%89

Start with the linked ProTable toolbar-custom demo and reproduce the flickering ellipsis when more than two toolbar menu items are present. Compare the observed behavior with the intended toolbar display, then verify the result in the demo using a current browser and record the relevant environment details.

Written by the indexing model from the issue text.