fix: Fix single Breadcrumb not show on PageHeader

[chenshuai2144]

🤔 This is a ...

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

👻 What's the background?

只有在大于等于 2 个的情况下面包屑才会显示

💡 Solution

close #17046

📝 Changelog

Language	Changelog
🇺🇸 English	Fix single Breadcrumb not show on PageHeader
🇨🇳 Chinese	修复单个 Breadcrumb 未在 PageHeader 上显示的问题

☑️ 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

[netlify]

Deploy preview for ant-design ready!

Built with commit 7e548e4

https://deploy-preview-17209--ant-design.netlify.com

[codecov]

Codecov Report

Merging #17209 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #17209      +/-   ##
==========================================
+ Coverage   95.95%   95.99%   +0.04%     
==========================================
  Files         263      263              
  Lines        7348     7348              
  Branches     2051     2013      -38     
==========================================
+ Hits         7051     7054       +3     
+ Misses        295      292       -3     
  Partials        2        2

Impacted Files	Coverage Δ
components/page-header/index.tsx	100% <100%> (ø)	⬆️
components/_util/wave.tsx	88.67% <0%> (+2.83%)	⬆️

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[zombieJ]

Fix single Breadcrumb not show on PageHeader