fix: Slider show empty tooltip when tooltip.formatter is falsy

[wanpan11]

中文版模板 / Chinese template

🤔 This is a ...

• [ ] New feature
• [x] Bug fix
• [ ] Site / documentation update
• [ ] Demo update
• [ ] Component style update
• [ ] TypeScript definition update
• [ ] Bundle size optimization
• [ ] Performance optimization
• [ ] Enhancement feature
• [ ] Internationalization
• [ ] Refactoring
• [ ] Code style optimization
• [x] Test Case
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🔗 Related issue link

fix https://github.com/ant-design/ant-design/issues/48668

💡 Background and solution

formatter=null 时没有隐藏 tooltip

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Slider tooltip cannot be hidden when tooltip={{ formatter: null }}.
🇨🇳 Chinese	修复 Slider tooltip={{ formatter: null }} 无法隐藏 Tooltip 的问题。

☑️ Self-Check before Merge

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

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

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👁 Visual Regression Report for PR #48673 Passed ✅

🎯 Target branch: master (0dd5617205afc9d5497ae4277a5eb7793a767464) 📖 View Full Report ↗︎

🎊 Congrats! No visual-regression diff found.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (cb19e0e) to head (383ea8d). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #48673 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 745 745 Lines 12946 12947 +1 Branches 3382 3383 +1 ========================================= + Hits 12946 12947 +1 ```

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