fix: submenu couldn't auto close

[mutouzdl]

[中文版模板 / Chinese template]

🤔 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

📝 Changelog

Language	Changelog
🇺🇸 English	fix: submenu couldn't auto close
🇨🇳 Chinese	修复: SubMenu 无法自动关闭

☑️ 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

[codecov-io]

Codecov Report

Merging #852 (1defff2) into master (811f035) will increase coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #852      +/-   ##
=========================================
+ Coverage    3.88%   3.96%   +0.08%     
=========================================
  Files         399     399              
  Lines       17781   17819      +38     
=========================================
+ Hits          690     707      +17     
- Misses      17091   17112      +21     

Impacted Files	Coverage Δ
...nts/core/Component/overlay/OverlayTrigger.razor.cs	8.90% <0.00%> (-0.20%)	⬇️
components/menu/SubMenu.razor	0.00% <ø> (ø)
components/tabs/TabPane.razor.cs	92.06% <0.00%> (-4.72%)	⬇️
components/core/JsInterop/JSInteropConstants.cs	7.50% <0.00%> (-0.20%)	⬇️
components/form/Form.razor.cs	0.00% <0.00%> (ø)
components/core/Component/overlay/Overlay.razor.cs	12.14% <0.00%> (+0.01%)	⬆️
components/tabs/Tabs.razor.cs	55.51% <0.00%> (+3.52%)	⬆️

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