fix(comp:switch): remove box-shadow for seer theme

[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?

switch存在box-shadow

What is the new behavior?

seer皮肤下去掉box-shadow

Other information

视觉检视

[idux-bot]

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[codecov]

Codecov Report

Merging #1209 (7373b2f) into next (f13e1ce) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 7373b2f differs from pull request most recent head 539ed71. Consider uploading reports for the commit 539ed71 to get more accurate results

@@            Coverage Diff             @@
##             next    #1209      +/-   ##
==========================================
- Coverage   92.67%   92.66%   -0.02%     
==========================================
  Files         316      316              
  Lines       29028    29033       +5     
  Branches     2371     2371              
==========================================
  Hits        26903    26903              
- Misses       2125     2130       +5     

Impacted Files	Coverage Δ
packages/components/watermark/src/Watermark.tsx	27.02% <0.00%> (-1.96%)	⬇️

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