fix: Cascader with same label & value makes display issue

[zombieJ]

resolve ant-design/ant-design#32820

[vercel]

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[codecov]

Codecov Report

Merging #215 (3435b3d) into master (fa61bbb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   99.71%   99.72%           
=======================================
  Files           9        9           
  Lines         355      359    +4     
  Branches       95       95           
=======================================
+ Hits          354      358    +4     
  Misses          1        1           

Impacted Files	Coverage Δ
src/util.ts	100.00% <ø> (ø)
src/Cascader.tsx	100.00% <100.00%> (ø)

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