There is only a single input box in the [bug report] form. Select the input box and click enter. The page will refresh

### Element UI version
2.13.2

### OS/Browsers version
macos catalina 10.15.5 (19F101) / chrome 83.0.4103.97

### Vue version
3.0.0-beta.15

### Reproduction Link
https://codepen.io/pen/?&editable=true=https%3A%2F%2Felement.eleme.cn%2F%3F

### Steps to reproduce
当form表单中只有1个输入框时，
点击回车键，刷新当前页面，链接被修改
如:修改前https://element.eleme.cn/#/zh-CN/component/form 修改后 https://element.eleme.cn/?#/zh-CN/component/form

### What is Expected?
不做任何动作

### What is actually happening?
页面刷新