[Bug Report] [MessageBox] 弹框中的"确定"按钮不应该有两种类型的class
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- Vue
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Description
### Element UI version
2.15.13
### OS/Browsers version
win10 / Chrome114
### Vue version
2.5.17
### Reproduction Link
https://codepen.io/linkun-wang/pen/MWzGyro
### Steps to reproduce
1、进入上述页面
2、点击打开Message Box
3、F12打开控制台选中【确定】按钮查看class
4、可以发现【确定】按钮的class中同时包含`"el-button--default"`和`"el-button--primary"`

### What is Expected?
弹框中【确定】按钮的class不应包含[default]演示类:`"el-button--default"`
### What is actually happening?
弹框中【确定】按钮的class中同时包含`"el-button--default"`和`"el-button--primary"`
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