Fixed system tray icon not disappearing on exit#960

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PianoMastR64 wants to merge 1 commit intolencx:mainfrom

PianoMastR64:main

Commits on Jun 15, 2023

Harsh std::process::exit(0); lines were replaced with app.exit(0); to fix system tray icon not disappearing on exit
PianoMastR64
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