🐛[BUG] ProFormTimePicker 默认的variant 变成borderless了，应该是outlined才对

提问前先看看：

https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way/blob/main/README-zh_CN.md

### 🐛 bug 描述
ProFormTimePicker组件的variant默认值变成了borderless，本应该是outlined
现在需要手动添加 fieldProps={{ variant: 'outlined' }} 才能解决

### 📷 复现步骤

### 🏞 期望结果
引入ProFormTimePicker，使用

期望是outlined的效果
### 💻 复现代码
` value?.format('HH:mm:ss')}
/>`

### © 版本信息

- ProComponents 版本: [e.g. 2.7.1]
- umi 版本 4.1.10
- 浏览器环境 124.0.6367.62（正式版本） (arm64)
- 开发环境 [e.g. mac OS] mac OS 14.4.1 (23E224)

### 🚑 其他信息

Start at the ProFormTimePicker component entry point and reproduce the reported example with umi 4.1.10 and the listed browser environment. Compare the default variant with fieldProps={{ variant: 'outlined' }}; done means the component uses outlined styling without that workaround and the behavior is covered by an appropriate test.

Written by the indexing model from the issue text.