fix installing ls mode

Author: yungwine

mytoninstaller/settings.py

@@ -894,4 +894,7 @@ def EnableMode(local):
 	args = ["python3", "-m", "mytoncore", "-e"]
 	if local.buffer.mode == 'liteserver':
 		args.append("enable_liteserver_mode")
+	else:
+		return
+	args = ["su", "-l", local.buffer.user, "-c", ' '.join(args)]
 	subprocess.run(args)