fix(form:select): correct trigger onSearch in reset when set value

[cipchk]

• close form select 设置 onSearch后无法使用设置enum来显示默认值 ng-alain#2427

PR Checklist

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• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[ng-alain-bot]

Preview is ready!

[codecov]

Codecov Report

Merging #1660 (5dbeaeb) into master (5edaa97) will decrease coverage by 0.03%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 5dbeaeb differs from pull request most recent head ae2195d. Consider uploading reports for the commit ae2195d to get more accurate results

@@            Coverage Diff             @@
##           master    #1660      +/-   ##
==========================================
- Coverage   95.53%   95.51%   -0.03%     
==========================================
  Files         282      282              
  Lines        8756     8758       +2     
  Branches     1648     1649       +1     
==========================================
  Hits         8365     8365              
- Misses        323      324       +1     
- Partials       68       69       +1     

Files	Coverage Δ
packages/form/src/widgets/select/select.widget.ts	96.42% <100.00%> (+0.13%)	⬆️

... and 1 file with indirect coverage changes