disable quit_cb so we can test doing fade out in the webview using javascript

src/lightdm-webkit2-greeter.c

@@ -215,7 +215,7 @@ main(int argc, char **argv) {
 	textdomain (GETTEXT_PACKAGE);
 
 	gtk_init(&argc, &argv);
-	g_unix_signal_add(SIGTERM, (GSourceFunc) quit_cb, /* is callback */ NULL);
+	// g_unix_signal_add(SIGTERM, (GSourceFunc) quit_cb, /* is callback */ NULL);
 
 	/* Apply greeter settings from config file */
 	keyfile = g_key_file_new();