fix(comp:tree-select): search input shouldn't be cleared after option checked

[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?

多选时，勾选树节点之后，搜索输入会被清除

What is the new behavior?

不应该清除

Other information

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (96492f8) to head (3121b6c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1886      +/-   ##
==========================================
- Coverage   90.78%   90.78%   -0.01%     
==========================================
  Files         359      359              
  Lines       35249    35247       -2     
  Branches     2807     2807              
==========================================
- Hits        32002    32000       -2     
  Misses       3247     3247              

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