child_process: change windowsHide default to true

This is likely the default that more Windows users are
expecting.

PR-URL: https://github.com/nodejs/node/pull/21316
Refs: https://github.com/libuv/libuv/pull/1878
Refs: https://github.com/nodejs/node/pull/21314


Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>