tabs组件异步加载时会默认选中第二项

[arika163]

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

Version

1.5.1

Environment

windows10@1909,chrome@81.0.4044.122,vue@2.6.11

Reproduction link

Steps to reproduce

已提供沙盒复现：
https://codesandbox.io/s/vibrant-cherry-qhd8n

What is expected?

按defaultActiveKey属性选中对应的tab

What is actually happening?

选中了第二个tab

[mudi-1125]

key要用string类型吧，key转成string就不会有问题了

[arika163]

key要用string类型吧，key转成string就不会有问题了

确实是这个问题，感谢指正！

[github-actions]

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