fix(FormItem): sync margin with design system value

[BlackySoul]

• close [Bug][FormLayoutGroup]: Некорректный горизонтальный отступ между двумя Input #6752

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- [ ] Unit-тесты

• e2e-тесты

- [ ] Дизайн-ревью

- [ ] Документация фичи

Описание

В дизайнс-системе отступы между FormItem равен 16px

[github-actions]

size-limit report 📦

Path	Size
JS	356.88 KB (0%)
JS (gzip)	108.94 KB (0%)
JS (brotli)	90.06 KB (0%)
JS import Div (tree shaking)	1.43 KB (0%)
CSS	261.8 KB (0%)
CSS (gzip)	34.37 KB (+0.01% 🔺)
CSS (brotli)	27.88 KB (+0.08% 🔺)

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[github-actions]

e2e tests

Playwright Report

[github-actions]

👀 Docs deployed

• ✅ Styleguide
• ✅ Storybook

Commit c57a18d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (4129e4d) to head (c57a18d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6753   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files         336      336           
  Lines       10359    10359           
  Branches     3469     3469           
=======================================
  Hits         8534     8534           
  Misses       1825     1825           

Flag	Coverage Δ
unittests	82.38% <ø> (ø)

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