fix: Tabs extraContent line-height

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

close #17865

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Tabs tabBarExtraContent align issue.
🇨🇳 Chinese	修复 Tabs tabBarExtraContent 不居中对齐的问题。

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[codecov]

Codecov Report

Merging #17969 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17969   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files         268      268           
  Lines        7467     7467           
  Branches     2044     2044           
=======================================
  Hits         7173     7173           
  Misses        292      292           
  Partials        2        2

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[codecov]

Codecov Report

Merging #17969 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17969   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files         268      268           
  Lines        7467     7467           
  Branches     2073     2044   -29     
=======================================
  Hits         7173     7173           
  Misses        292      292           
  Partials        2        2

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b71f2ec...65f6ddb. Read the comment docs.