fix(table): fix fixed column background style issue in dark mode

[oljc]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

暗黑模式下固定列的选中项背景样式透明导致内容重叠

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
Table	修复暗黑模式下固定列选中背景样式透明	Fix fixed column background style issue in dark mode	Closes #2671, Closes #3362, Closes #3365

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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