[Bug Report] 时间选择器选择类型daterange后，clearable设置true无法显示清除按钮
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- Dominant language
- Vue
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Description
### Element UI version
2.15.6
### OS/Browsers version
macos 11.4/谷歌浏览器100.0.4896.127
### Vue version
2.6.14
### Reproduction Link
https://codepen.io/towry/pen/yLzNYmL?editors=1111
### Steps to reproduce
代码如下
### What is actually happening?
设置clearable等于true后，清除按钮并没有显示
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