fix(module: segmented): binding value type causes an incorrect initialization selection

[ElderJames]

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🔗 Related issue link

fixed #2868

💡 Background and solution

While TValue is value type, DefaultValue !=null is always true, but the DefaultValue default is not the binding value, so it would cause incorrect binding at initial time.

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed binding value type causes an incorrect initialization selection
🇨🇳 Chinese	修复绑定值类型导致初始化选中错误

☑️ 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

Base: 44.20% // Head: 44.60% // Increases project coverage by +0.40% 🎉

Coverage data is based on head (bd34adc) compared to base (97fcd5b).
Patch coverage: 63.63% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2869      +/-   ##
==========================================
+ Coverage   44.20%   44.60%   +0.40%     
==========================================
  Files         545      545              
  Lines       25775    25779       +4     
  Branches      261      261              
==========================================
+ Hits        11394    11500     +106     
+ Misses      14341    14239     -102     
  Partials       40       40              

Impacted Files	Coverage Δ
components/segmented/Segmented.razor.cs	66.66% <60.00%> (+66.66%)	⬆️
components/segmented/SegmentedItem.razor.cs	80.76% <100.00%> (+80.76%)	⬆️
components/core/JsInterop/JSInteropConstants.cs	34.40% <0.00%> (+1.60%)	⬆️
components/segmented/SegmentedItem.razor	57.14% <0.00%> (+57.14%)	⬆️
components/segmented/Segmented.razor	87.50% <0.00%> (+87.50%)	⬆️

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