fix: should process 0 correctly when precision is 0

[boomler]

Fix the issue reported by:
ant-design/ant-design#33084 (comment)

[vercel]

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[codecov]

Codecov Report

Merging #390 (c8d2672) into master (d3de147) will increase coverage by 0.88%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #390      +/-   ##
==========================================
+ Coverage   97.76%   98.65%   +0.88%     
==========================================
  Files           9        9              
  Lines         448      445       -3     
  Branches      116      116              
==========================================
+ Hits          438      439       +1     
+ Misses         10        6       -4     

Impacted Files	Coverage Δ
src/InputNumber.tsx	98.40% <100.00%> (ø)
src/utils/MiniDecimal.ts	99.26% <100.00%> (+2.86%)	⬆️

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[boomler]

Hi @zombieJ . This pr is to solve a bug caused by #385.
I think this bug is quit easy to happen, so let's see whether this is a good solution or you have other suggestions.