DirectoryTree 的switcherIcon不生效

[qq792453582]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.4.10

Environment

Current ant-design-vue version: 1.4.10

Reproduction link

Steps to reproduce

<a-directory-tree :treeData="treeData" defaultExpandAll>
<a-icon type="down" slot="switcherIcon"/>
</a-directory-tree>

What is expected?

switcherIcon正确修改切换图标

What is actually happening?

switcherIcon无法正确修改切换图标

[github-actions]

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