Sider collapsedWidth not work in Menu

[zhuwy]

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

Reproduction link

Steps to reproduce

set Sider prop collapsedWidth={60}
collapse the Sider

What is expected?

Menu width is 60

What is actually happening?

Menu width is 80 (which is the defaultValue of the collapsedWidth prop in Sider)

Environment	Info
antd	4.15.3
React	16.14.0
System	macOS Catalina 10.15.7
Browser	chrome 90.0.4430.85

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notice that the .ant-menu-inline-collapsed class seem to has hardcode style：
width: 80px

[xrkffgg]

收起的时候 动态给 Menu 加一个 style={{ width: 60 }}