fix thread arg

visor.c

@@ -273,7 +273,7 @@ int main(int argc, char **argv)
 	app = gtk_application_new("cool.bonsai.mandelbrot-visualizer",
 			G_APPLICATION_DEFAULT_FLAGS);
 	g_signal_connect(app, "activate", G_CALLBACK(app_activate), NULL);
-	stat = g_application_run(G_APPLICATION(app), argc, argv);
+	stat = g_application_run(G_APPLICATION(app), 1, argv);
 	g_object_unref(app);
 
 	return stat;