[Bug Report] skeleton组件rows为2时，显示效果为一行
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- Dominant language
- Vue
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Description
### Element UI version
2.15.8
### OS/Browsers version
window10/Google Chrome 版本 100.0.4896.88（正式版本） （64 位）
### Vue version
2.6.14
### Reproduction Link
https://codepen.io/wangkaimin/pen/YzYBzqV?editors=1111
### Steps to reproduce
打开重现链接就可以看到效果
### What is Expected?
显示为两行
### What is actually happening?
显示为一行
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