fix: icon set dropdown style

[siam-ese]

close https://github.com/dream-num/univer-workspace/issues/289

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 27.12%. Comparing base (2d5de98) to head (1b8855d).

Files	Patch %	Lines
packages/ui/src/components/hooks/layout.ts	0.00%	7 Missing ⚠️
...ting-ui/src/components/panel/rule-edit/iconSet.tsx	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2602   +/-   ##
=======================================
  Coverage   27.12%   27.12%           
=======================================
  Files        1675     1675           
  Lines       84653    84647    -6     
  Branches    17642    17642           
=======================================
  Hits        22961    22961           
+ Misses      61692    61686    -6     

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[wzhudev]

LGTM