🐛[BUG] 多tab模式layout的content区域样式问题

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

多tab模式下，当tab数减少至1到2个时，content区域会产生padding，增加tab数量后padding消失。

### © 版本信息

- ProComponents 版本: 2.6.44
- umi 版本 4.1.0
- 浏览器环境 chrome 121.0.6167.85（正式版本） (arm64)
- 开发环境 macOS

一个tab

多个tab

修复方法：proLayout 内设置 contentStyle: { padding: "0px"}

Start by reproducing the layout in ProLayout with one or two tabs, then compare it with the multi-tab case using the reported ProComponents 2.6.44 and umi 4.1.0 versions. Inspect the content area and the contentStyle setting; done means the content area no longer gains unwanted padding when the tab count is reduced, without breaking the multi-tab layout.

Written by the indexing model from the issue text.