fix: change tag td => th

[li-jia-nan]

• close 没有设置 title 的列，展示时表头变成了 td，应该是 th #1066

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Name	Status	Preview	Comments	Updated (UTC)
table	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 4, 2024 10:11am

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (4b67382) 99.51% compared to head (bdfb8bf) 50.21%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
docs/examples/fixedColumns.tsx	0.00%	2 Missing ⚠️
src/hooks/useColumns/index.tsx	94.44%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1075       +/-   ##
===========================================
- Coverage   99.51%   50.21%   -49.31%     
===========================================
  Files          47       97       +50     
  Lines        4569     9065     +4496     
  Branches      579      631       +52     
===========================================
+ Hits         4547     4552        +5     
- Misses         22     4463     +4441     
- Partials        0       50       +50     

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