fix: column[align] should not override custom cell style #973

[sendya]

This is a ...

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

What's the background?

1. TableCell tdProps style overrided not extend when column set align

Changelog description (Optional if not new feature)

1. English description
   column[align] should not override custom cell style TableCell tdProps style overrided not extend when column set align #973
2. Chinese description (optional)
   修正 customCell 在使用 align 属性时，导致 style 被覆盖 TableCell tdProps style overrided not extend when column set align #973

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

@@           Coverage Diff           @@
##           master     #983   +/-   ##
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  Coverage   87.25%   87.25%           
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  Files         145      145           
  Lines        4832     4832           
  Branches     1423     1423           
=======================================
  Hits         4216     4216           
  Misses        572      572           
  Partials       44       44

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[github-actions]

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