fix(components): [tabs] nav offset error when use both number and string

[tolking]

closed #8565

Please make sure these boxes are checked before submitting your PR, thank you!

• [x] Make sure you follow contributing guide English | (中文 | Español | Français).
• [x] Make sure you are merging your commits to dev branch.
• [x] Add some descriptions and refer to relative issues for your PR.

The uid is a unique value in Vue, so use uid instead of tabName to distinguish different TabBar components.

before

after

[github-actions[bot]]

[github-actions[bot]]

🧪 Playground Preview: https://element-plus.run/?pr=9222 Please comment the example via this playground if needed.

[tolking]

@btea done