button loading 属性生成的圈圈图标不居中

[unihon]

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

Version

1.4.2

Environment

Vue: 2.5.22

Reproduction link

Steps to reproduce

<a-button icon="loading"/>
<a-button loading="true"/>

What is expected?

button 通过 loading 属性控制的图标能居中。

What is actually happening?

通过 loading 属性控制的图标发生了左右位移，button 的 padding-left 变了。

[github-actions]

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