fix: add default value for gap

[MadCcc]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• 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
• Test Case
• Branch merge
• Workflow
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Watermark that gap should have default value when passing undefined in array.
🇨🇳 Chinese	修复 Watermark 组件 gap 在数组中含有 undefined 时没有默认值的问题。

☑️ Self-Check before Merge

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

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
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---

🚀 Summary

🤖 Generated by Copilot at e36b448

Refactored the gap prop logic in the Watermark component to use cleaner and more consistent syntax. This improves the code quality and performance of the components/watermark/index.tsx file.

🔍 Walkthrough

🤖 Generated by Copilot at e36b448

• Add constants for default gap values (link)
• Use constants for default gap prop in Watermark component (link)
• Handle undefined or incomplete gap prop with default values (link)

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size-limit report 📦

Path	Size
./dist/antd.min.js	398.15 KB (+5 B 🔺)
./dist/antd-with-locales.min.js	457.47 KB (+6 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Oct 26, 2023, 6:35 AM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (15acef5) 100.00% compared to head (e36b448) 100.00%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #45537   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          694       694           
  Lines        11678     11694   +16     
  Branches      3120      3129    +9     
=========================================
+ Hits         11678     11694   +16     

Files	Coverage Δ
components/watermark/index.tsx	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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