fix(Swipe): leak when width has decimal

[chenjiahan]

#7422

[github-actions]

🎊 PR Preview 5b4e063 has been successfully built and deployed to https://youzan-vant-preview-pr-7562.surge.sh

🕐 Build time: 81.648s

_{🤖 By surge-preview}

[codecov-io]

Codecov Report

Merging #7562 (f712816) into 2.x (6569096) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              2.x    #7562      +/-   ##
==========================================
+ Coverage   90.70%   90.78%   +0.07%     
==========================================
  Files         179      179              
  Lines        4908     4904       -4     
  Branches      297      295       -2     
==========================================
  Hits         4452     4452              
+ Misses        418      415       -3     
+ Partials       38       37       -1     

Impacted Files	Coverage Δ
src/swipe/index.js	91.42% <100.00%> (ø)
src/utils/dom/scroll.ts	70.00% <0.00%> (+8.23%)	⬆️

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