style: 调整 Item 纵向间距为 20px

[iahu]

• 调整 Item 纵向间距为 20px
• 去掉末尾 Item 的间距

[vercel]

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[codecov]

Codecov Report

Merging #593 (794a4bd) into master (ebf33d8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #593   +/-   ##
=======================================
  Coverage   83.15%   83.16%           
=======================================
  Files         126      126           
  Lines        4204     4206    +2     
  Branches     1111     1113    +2     
=======================================
+ Hits         3496     3498    +2     
  Misses        705      705           
  Partials        3        3           

Impacted Files	Coverage Δ
...ges/components/src/components/form/ItemControl.tsx	94.44% <100.00%> (+0.69%)	⬆️

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