[stable8] fix(NcFormBox): use default text color in items

[backportbot]

Backport of PR #7854

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.08%. Comparing base (f7f2506) to head (e6f6ec9).
⚠️ Report is 2 commits behind head on stable8.

Additional details and impacted files

@@           Coverage Diff            @@
##           stable8    #7857   +/-   ##
========================================
  Coverage    45.08%   45.08%           
========================================
  Files          191      191           
  Lines         4749     4749           
  Branches      1226     1226           
========================================
  Hits          2141     2141           
  Misses        2512     2512           
  Partials        96       96           

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