fix(FloatingPanel): fix rendering gaps caused by decimal point

[IronKinoko]

fix #5538

[github-actions[bot]]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-5551.surge.sh

[awmleer]

CI 挂了，我重新跑一下试试

[codecov[bot]]

Codecov Report

Merging #5551 (8f1f39e) into master (25c7aca) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5551      +/-   ##
==========================================
+ Coverage   89.82%   89.93%   +0.11%     
==========================================
  Files         294      294              
  Lines        6251     6251              
  Branches     1529     1529              
==========================================
+ Hits         5615     5622       +7     
+ Misses        589      583       -6     
+ Partials       47       46       -1     

Impacted Files	Coverage Δ
src/components/floating-panel/floating-panel.tsx	94.20% <100.00%> (ø)
src/components/image-uploader/image-uploader.tsx	93.26% <0.00%> (+6.73%)	:arrow_up:

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