hopefully fixup UP on linux when backgrounded

lib/controllers/unified_push.dart

@@ -68,6 +68,7 @@ class UnifiedPushController extends AsyncNotifier<bool> {
                 await windowManager.isFocused().onError((_, _) => false) &&
                 ref.watch(KeyController.provider(KeyController.roomKey)) ==
                     event.roomId)) {
+          if (isInBackground) exit(0);
           return;
         }
 

lib/main.dart

@@ -88,7 +88,13 @@ void main(List<String> args) async {
   FlutterError.onError = (FlutterErrorDetails details) =>
       showError(details.exception.toString(), details.stack);
 
-  if (!isInBackground) {
+  if (isInBackground) {
+    await ProviderContainer().read(UnifiedPushController.provider.future);
+
+    // In case it didn't exit for some reason
+    await Future.delayed(Duration(seconds: 20));
+    exit(0);
+  } else {
     runApp(
       ProviderScope(
         retry: (_, _) => null,