src: reset TTY mode before cleaning up resources

Otherwise, closing all handles associated with the main
event loop would also mean that `uv_tty_reset_mode()`
can’t function properly because the corresponding FDs have
already been closed.

Fixes: https://github.com/nodejs/node/issues/21020
PR-URL: https://github.com/nodejs/node/pull/21257


Reviewed-By: Richard Lau <riclau@uk.ibm.com>