🐛[BUG] Prolayout Sider Token 在 menu 类型为 group下时，无法设置一级标题颜色

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

在Umi中，使用默认的Prolayout时，如果把menu类型设置为group，无法设置一级标题的颜色

### 📷 复现步骤

Prolayout中将 menu 设置为 type: group，将无法设置一级标题颜色（具体设置见代码部分）


### 🏞 期望结果

menu 类型为 group时，应该允许设置一级标题颜色

### 💻 复现代码

```
{
menu: {
locale: false,
type: 'group',
},
token: {
sider: {
colorMenuBackground: '#242424',
colorTextMenuTitle: '#FFFFFF',
colorMenuItemDivider: '#383838',

colorTextMenu: '#FFFFFF',
colorTextMenuSelected: '#FFFFFF',
colorTextMenuActive: '#FFFFFF',
colorTextMenuItemHover: '#FFFFFF',

colorBgMenuItemActive: '#0052D9',
colorBgMenuItemHover: '#0052D9',
colorBgMenuItemSelected: '#0052D9',
},
pageContainer: {
colorBgPageContainer: '#F3F3F3',
},
}
}
```

### © 版本信息

- ProComponents 版本: 2.4.4
- umi 版本 4.3.36
- 浏览器环境 edge
- 开发环境 Linux mint

### 🚑 其他信息

Start by reproducing the issue in ProLayout with menu.type set to group and the provided sider token configuration. Trace how the grouped menu renders its first-level headings and verify that colorTextMenuTitle is applied there; done means the configured first-level heading color appears in the group menu.

Written by the indexing model from the issue text.