fix: Last one also take in count

[zombieJ]

resolve ant-design/ant-design#30813

[vercel]

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🔍 Inspect: https://vercel.com/react-component/overflow/DHusmzY3qYgRgS4LgZbkRryssPZC
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[codecov]

Codecov Report

Merging #13 (500bbbb) into master (e1c0a44) will increase coverage by 0.98%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #13      +/-   ##
===========================================
+ Coverage   99.01%   100.00%   +0.98%     
===========================================
  Files           4         4              
  Lines         203       200       -3     
  Branches       62        62              
===========================================
- Hits          201       200       -1     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
src/Overflow.tsx	100.00% <100.00%> (+1.44%)	⬆️

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