CascadeSelect slot 型展示的问题

[eternalsky]

请按照以下模板填写

这是一个

• [x] 错误报告
• [ ] 功能需求

SaltUI 版本

3.1.14

浏览器、操作系统等环境信息

复现步骤

• 配置选项时有的选项没有达到想要的层级（比如正常显示三级、但只有一级）
• 划到这样的选项时会出现 SLot 只有一列并且居中对不齐的情况出现。

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