fix(module: tree): Fix search crash issue after Tree custom SearchExpression

[ruyisee]

🤔 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
• Other (about what?)

🔗 Related issue link

💡 Background and solution

• Tree自定义SearchExpression后Title中不包括过滤内容导致的bug
• 判断要匹配字符串在Title内的index，只有 index>-1才做匹配高亮

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ 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]

[ruyisee]

@dotnet-policy-service agree

[ElderJames]

Thanks for contribution @ruyisee , please chekout the review commonts.

[ElderJames]

LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.43 🎉

Comparison is base (61bfb03) 45.27% compared to head (852c517) 46.70%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3274      +/-   ##
==========================================
+ Coverage   45.27%   46.70%   +1.43%     
==========================================
  Files         557      557              
  Lines       26725    26731       +6     
  Branches      266      266              
==========================================
+ Hits        12100    12485     +385     
+ Misses      14585    14206     -379     
  Partials       40       40              

Impacted Files	Coverage Δ
components/table/Column.razor	0.00% <0.00%> (ø)
components/table/Column.razor.cs	0.00% <0.00%> (ø)
components/tree/TreeNodeTitle.razor	20.00% <0.00%> (-1.63%)	⬇️

... and 24 files with indirect coverage changes

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