fix(NcAppNavigationItem): tabbing on editable items

[GVodyanov]

☑️ Resolves

• Fix Editable NcAppNavigationItem traps tab navigation #8205

🖼️ Screenshots

🏁 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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.84%. Comparing base (985023c) to head (ff02637).
⚠️ Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8212      +/-   ##
==========================================
+ Coverage   52.82%   52.84%   +0.02%     
==========================================
  Files         103      103              
  Lines        3351     3351              
  Branches      976      976              
==========================================
+ Hits         1770     1771       +1     
+ Misses       1333     1332       -1     
  Partials      248      248              

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