fix Obs shutdown hook

src/main/kotlin/net/eksb/obsdc/Obs.kt

@@ -67,7 +67,7 @@ class Obs(
 		// OBSRemoteController starts a non-daemon thread. It probably should not do that.
 		// Kill it on shutdown.
 		addShutdownHook {
-			controller.stop()
+			close()
 		}
 	}