fix(components): [tabs] lssues(#16835)

[Yolo-00]

[Component] [tabs] when addable is enabled and tab-position is set to left, the position of the add icon is wrong. #16835

[pull-request-triage]

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[github-actions]

[github-actions]

Hello @Yolo-00, thank you for contributing to element-plus, please see our guideline to see how to make contribution

[github-actions]

🧪 Playground Preview: https://element-plus.run/?pr=16847
Please comment the example via this playground if needed.

[warmthsea]

👀

[Yolo-00]

请问是我提交的 pr 有什么问题吗？
因为是第一次提交 ``pr 有很多地方不太清楚如果有什么问题的话，麻烦提出我这边在做改进

[warmthsea]

请问是我提交的 pr 有什么问题吗？ 因为是第一次提交 ``pr 有很多地方不太清楚如果有什么问题的话，麻烦提出我这边在做改进

1、需要把 == 改成 ===
我在你这个 PR 之后提交了一个 新的PR 用来限制 == 的使用
#16860

2、需要更改一下你这条PR的标题（参考其它 PR）