fix(Popover): incorrect border position in wework

[chenjiahan]

#7698

[github-actions]

🎊 PR Preview 2e6b032 has been successfully built and deployed to https://youzan-vant-preview-pr-7702.surge.sh

🕐 Build time: 84.298s

_{🤖 By surge-preview}

[codecov-io]

Codecov Report

Merging #7702 (a2385ff) into 2.x (52d882e) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              2.x    #7702      +/-   ##
==========================================
- Coverage   90.90%   90.86%   -0.04%     
==========================================
  Files         181      181              
  Lines        4948     4950       +2     
  Branches      295      295              
==========================================
  Hits         4498     4498              
- Misses        413      415       +2     
  Partials       37       37              

Impacted Files	Coverage Δ
src/popover/index.js	100.00% <ø> (ø)
src/stepper/index.js	97.82% <0.00%> (-2.18%)	⬇️

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