[stable8] fix(NcAppNavigation): also emit navigation-toggled on mobile change

[skjnldsv]

Backport of #8353

🏁 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

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 45.85%. Comparing base (f57b50c) to head (9217d37).

Files with missing lines	Patch %	Lines
src/components/NcAppNavigation/NcAppNavigation.vue	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           stable8    #8354   +/-   ##
========================================
  Coverage    45.85%   45.85%           
========================================
  Files          194      194           
  Lines         4892     4892           
  Branches      1262     1200   -62     
========================================
  Hits          2243     2243           
- Misses        2561     2563    +2     
+ Partials        88       86    -2     

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