Layout侧边布局collapsible样式异常

[shanlh]

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

Version

1.1.2

Environment

macOS High Sierra 10.13.6; Chrome 69.0.3497.100; Vue 2.5.17

Reproduction link

https://vuecomponent.github.io/ant-design-vue/components/layout-cn/#%E4%BE%A7%E8%BE%B9%E5%B8%83%E5%B1%80

Steps to reproduce

a-layout-sider存在collapsible属性时，左下的箭头指示按钮没有宽度

What is expected?

可以根据折叠状态设置宽度

What is actually happening?

没有宽度，官网示例可以复现

[github-actions]

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