fs: fchmod->fchown in promises/lchown

This was a clear error.

chown should do chown, not chmod.

PR-URL: #20407
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jamie Davis <davisjam@vt.edu>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

lib/internal/fs/promises.js

@@ -388,7 +388,7 @@ async function lchown(path, uid, gid) {
   if (O_SYMLINK !== undefined) {
     const fd = await open(path,
                           O_WRONLY | O_SYMLINK);
-    return fchmod(fd, uid, gid).finally(fd.close.bind(fd));
+    return fchown(fd, uid, gid).finally(fd.close.bind(fd));
   }
   throw new ERR_METHOD_NOT_IMPLEMENTED();
 }