全局配置ConfigProvider设置了prefixCls，对modal组件不生效

[mingtianyihou33]

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全局配置ConfigProvider设置了prefixCls，对modal组件不生效。modal组件依旧使用ant作为样式前缀。
注意：不是用 https://vuecomponent.github.io/issue-helper/ 或 http://ant-design-vue.gitee.io/issue-helper/ 创建的 issue 会被立即关闭。

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