fix(comp:control-trigger): mousedown on overlay triggers blur

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

当contro-trigger的浮层中不存在任何一个可聚焦的元素时，在浮层上触发的 mousedown 会触发 blur 事件并使浮层关闭

What is the new behavior?

修复以上问题

Other information

[idux-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.87%. Comparing base (9dd2900) to head (97a0c1d).

Files	Patch %	Lines
...ents/control-trigger/src/ControlTriggerOverlay.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1982      +/-   ##
==========================================
- Coverage   90.88%   90.87%   -0.01%     
==========================================
  Files         358      358              
  Lines       35824    35826       +2     
  Branches     3901     3901              
==========================================
  Hits        32558    32558              
- Misses       3266     3268       +2     

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