fix(NcActionCheckbox): margin around the checkbox

[GretaD]

☑️ Resolves

• Ref Design review v5 nextcloud/mail#11328

🖼️ Screenshots

🚧 Tasks

• Some margin from inputs.scss is applied that creates that small space between the label and the checkbox. This fixes it. I cannot think of any better solution

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[GretaD]

/backport to stable8

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.11%. Comparing base (8e6c2a6) to head (a7896a9).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7890   +/-   ##
=======================================
  Coverage   52.11%   52.11%           
=======================================
  Files         100      100           
  Lines        3170     3170           
  Branches      872      873    +1     
=======================================
  Hits         1652     1652           
  Misses       1271     1271           
  Partials      247      247           

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