child_process: change windowsHide default to true
This is likely the default that more Windows users are expecting.
Refs: https://github.com/libuv/libuv/pull/1878 Refs: https://github.com/nodejs/node/pull/21314
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines