util: simplify code

Simplify code by using return value of Object.defineProperty directly.

PR-URL: https://github.com/nodejs/node/pull/25162


Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>