:bug: fix side menu border
:bug: fix side menu border

https://github.com/ant-design/ant-design/pull/20330/commits/935e4fd1c47212a0a358be90f991e49fc470d0ff#r360345135

elevensky/ant-design,ant-design/ant-design,icaife/ant-design,icaife/ant-design,zheeeng/ant-design,ant-design/ant-design,elevensky/ant-design,icaife/ant-design,zheeeng/ant-design,icaife/ant-design,ant-design/ant-design,elevensky/ant-design,zheeeng/ant-design,ant-design/ant-design,elevensky/ant-design,zheeeng/ant-design