Fixes #2138, closes #2127

Return code 0 when running application found

src/main/java/org/cryptomator/launcher/Cryptomator.java

@@ -79,7 +79,7 @@ public class Cryptomator {
 				communicator.sendHandleLaunchargs(List.of(args));
 				communicator.sendRevealRunningApp();
 				LOG.info("Found running application instance. Shutting down...");
-				return 2;
+				return 0;
 			} else {
 				shutdownHook.runOnShutdown(communicator::closeUnchecked);
 				var executor = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("IPC-%d").build());