[Bug Report] $msgbox 内容是vnode。el-color-picker 的时候 颜色选择器的输入框不可以输入 无法获得焦点

### Element UI version
2.15.14

### OS/Browsers version
mac

### Vue version
2.7.16

### Reproduction Link
https://codepen.io/pen

### Steps to reproduce
$msgbox 内容是vnode。el-color-picker 的时候 颜色选择器的输入框不可以输入 无法获得焦点

### What is Expected?
能够输入颜色值

### What is actually happening?
不可以输入颜色值

Start with the CodePen reproduction linked in the issue and inspect the interaction between a vnode passed to $msgbox and el-color-picker. Reproduce the focus and color-input failure, then trace the relevant frontend component behavior. Done means the color picker input can receive focus and accept a color value in this scenario.

Written by the indexing model from the issue text.