[stable8] fix(NcFormBox*): user-select: none on Safari as well

[backportbot]

Backport of PR #7792

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.69%. Comparing base (085edf3) to head (e3c8681).
⚠️ Report is 5 commits behind head on stable8.

Additional details and impacted files

@@           Coverage Diff            @@
##           stable8    #7796   +/-   ##
========================================
  Coverage    44.69%   44.69%           
========================================
  Files          187      187           
  Lines         4652     4652           
  Branches      1211     1151   -60     
========================================
  Hits          2079     2079           
- Misses        2478     2480    +2     
+ Partials        95       93    -2     

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