fix(NcFormBox*): user-select: none on Safari as well

[ShGKme]

☑️ Resolves

• I missed that use-select is still not supported on Safari without a prefix

🏁 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

[ShGKme]

/backport to stable8

[ShGKme]

Tested by @kra-mo on Safari

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.57%. Comparing base (b0a5563) to head (a0172e4).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7792   +/-   ##
=======================================
  Coverage   51.57%   51.57%           
=======================================
  Files          96       96           
  Lines        3143     3143           
  Branches      863      864    +1     
=======================================
  Hits         1621     1621           
  Misses       1274     1274           
  Partials      248      248           

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