Removed activateIgnoringOtherApps call in macOS shutdown code to avoid JUCE stealing keyboard focus from other apps

modules/juce_events/native/juce_mac_MessageManager.mm

@@ -261,7 +261,6 @@ void MessageManager::runDispatchLoop()
 static void shutdownNSApp()
 {
     [NSApp stop: nil];
-    [NSApp activateIgnoringOtherApps: YES]; // (if the app is inactive, it sits there and ignores the quit request until the next time it gets activated)
     [NSEvent startPeriodicEventsAfterDelay: 0  withPeriod: 0.1];
 }