<a-dropdown> 多个按钮组合时，设置disabled 禁用时 未变成灰色

[ly12530]

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

Version

1.4.4

Environment

windowsx64， chrome 77.0.3865.90（正式版本） （64 位）， vue 2.6.10

Reproduction link

https://c5t7b.csb.app

Steps to reproduce

多个按钮组合时，设置disabled 禁用时 未变成灰色

What is expected?

多个按钮组合时，设置disabled 禁用时 变成灰色

What is actually happening?

多个按钮组合时，设置disabled 禁用时 未变成灰色

[github-actions]

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