fix: select display problem

[SorrowX]

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[SorrowX]

select组件下拉列表label不展示问题，复现地址：https://element-plus.formilyjs.org/guide/select.html#markup-schema-%E5%90%8C%E6%AD%A5%E6%95%B0%E6%8D%AE%E6%BA%90%E6%A1%88%E4%BE%8B

上述pr已修复，文档及demo添加作用域插槽案例

请大佬审核 下代码