data-picker 添加了valueFormat 属性后，日期弹出来 选择日期时间并不会改变但是change事件里能返回正确的选中的日期。

[ShootingKiler]

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

Version

1.6.4

Environment

vue 2.6.10, antdv 1.6.4

Reproduction link

https://www.antdv.com/components/date-picker-cn/#API

Steps to reproduce

1.创建一个date-picker
2.添加valueFormat 为 string
3.选择日期，不能选中。并且值不变

What is expected?

能够像正常模式的日期插件一样，选中。

What is actually happening?

value 值我不想用moment 对象，想用字符串，发现不能用

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