style(Collapse): adjust border gap

[chenjiahan]

No description provided.

[codecov-commenter]

Codecov Report

Merging #6361 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #6361   +/-   ##
=======================================
  Coverage   91.26%   91.26%           
=======================================
  Files         171      171           
  Lines        4510     4510           
  Branches      292      292           
=======================================
  Hits         4116     4116           
  Misses        353      353           
  Partials       41       41           

Impacted Files	Coverage Δ
src/collapse-item/index.js	86.27% <ø> (ø)

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