lib: remove unnecesary else block

The if statement inside the _writeHostObject function
returns an expression which makes the else block unnecessary.

PR-URL: https://github.com/nodejs/node/pull/32644


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>