Fix for application close shortcut

[raivisdejus]

Fix for #1622

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.90%. Comparing base (81fdc26) to head (2457b0f).

Files with missing lines	Patch %	Lines
buzz/widgets/application.py	66.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1624      +/-   ##
==========================================
- Coverage   83.91%   83.90%   -0.02%     
==========================================
  Files         115      115              
  Lines       13605    13615      +10     
==========================================
+ Hits        11417    11423       +6     
- Misses       2188     2192       +4     

Flag	Coverage Δ
Linux	83.15% <66.66%> (-0.01%)	⬇️
macOS	83.59% <66.66%> (-0.05%)	⬇️

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