Empty setting configProvider prefixcls does not take effect

[candy-Tong]

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

Version

1.7.6

Environment

windows10,google chrome 79.0.3945.130,vue 2.6.10

Reproduction link

Steps to reproduce

1. 用configProvider设置prefixCls
2. 使用empty组件

What is expected?

empty组件的class，会被改变成设置的prefixCls

What is actually happening?

empty组件的class，没有被改变成设置的prefixCls

---

https://github.com/vueComponent/ant-design-vue/blob/1.7.3/components/empty/index.jsx#L32
不应该使用ConfigConsumerProps.getPrefixCls方法
应该像下面代码，inject configProvider
https://github.com/vueComponent/ant-design-vue/blob/1.7.3/components/input/Input.jsx#L62

[candy-Tong]

message configProvider prefixCls 也不生效
https://github.com/vueComponent/ant-design-vue/blob/next/components/message/index.tsx#L13

[tangjinzhou]

message.config(options)

message configProvider prefixCls 也不生效
https://github.com/vueComponent/ant-design-vue/blob/next/components/message/index.tsx#L13

[github-actions]

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