fix(module: select): DropdownRender doesn't pass original content into renderfargment

[ElderJames]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
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🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed Select that the DropdownRender doesn't pass original content into renderfargment
🇨🇳 Chinese	修复 Select 的 DropdownRender 属性没有传入原内容

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Changelog is provided or not needed

[github-actions]

[codecov]

Codecov Report

Attention: 82 lines in your changes are missing coverage. Please review.

Comparison is base (ae67bcb) 1.51% compared to head (766d379) 1.50%.

Files	Patch %	Lines
components/select/Select.razor	0.00%	81 Missing ⚠️
components/select/Select.razor.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3675      +/-   ##
=========================================
- Coverage    1.51%   1.50%   -0.01%     
=========================================
  Files         572     572              
  Lines       27587   27688     +101     
  Branches     5600    5595       -5     
=========================================
  Hits          417     417              
- Misses      27130   27231     +101     
  Partials       40      40              

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