tree table expandIcon slot usage is invalid

[zhaogaolei]

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

Version

1.6.2

Environment

vue2.6 Google Chrome 92.0.4515.107 正式版本

Reproduction link

Steps to reproduce

What is expected?

解决问题

What is actually happening?

table的expandIcon API使用插槽写法时并没有生效

[zkwolf]

1.x现在只维护1.7版本了，可以考虑jsx

[tangjinzhou]

v1.7.7

[github-actions]

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