Feat/scrollbar always visible space correction

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[中文版模板 / Chinese template]

🤔 This is a ...

• [x] New feature
• [ ] Bug fix
• [ ] TypeScript definition update
• [ ] Bundle size optimization
• [ ] Performance optimization
• [ ] Enhancement feature
• [ ] Refactoring
• [ ] Update dependency
• [ ] Code style optimization
• [ ] Test Case
• [ ] Branch merge
• [ ] Site / documentation update
• [ ] Demo update
• [ ] Workflow
• [ ] Chore
• [ ] Release
• [ ] Other (about what?)

🔗 Related issue link

https://github.com/VisActor/VTable/issues/3742

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	scrollbar always visible space correction
🇨🇳 Chinese	scrollStyle.visible = 'always' 时没触发滚动条高度则不占用宽度

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

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

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🚀 Summary

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🔍 Walkthrough

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