:clapper: fix Form demo warning (#21576)
:clapper: fix Form demo warning (#21576)

close #21543
icaife/ant-design,zheeeng/ant-design,ant-design/ant-design,zheeeng/ant-design,ant-design/ant-design,ant-design/ant-design,zheeeng/ant-design,ant-design/ant-design,icaife/ant-design,zheeeng/ant-design,icaife/ant-design,elevensky/ant-design,elevensky/ant-design,elevensky/ant-design,elevensky/ant-design,icaife/ant-design