time-picker bug when use backspace to clear input

[zkwolf]

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

Version

1.3.16-latest

Environment

chrome 76

Reproduction link

https://vue.ant.design/components/time-picker-cn/#components-time-picker-demo-basic

Steps to reproduce

1.选择一个时间

2.backspace清空

3.输入数字

What is expected?

清空后输入数字直接显示

What is actually happening?

控制台报错 第一个输入数字无显示，再输入可以正常工作

---

1.报错是因为Header.jsx文件中尝试修改props showStr导致warning

2.将showStr相关去掉可以解决此bug，但是未知副作用

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