net: check for close on stream, not parent

'close' event isn't emitted on a TLS connection if it's been written to
(but 'end' and 'finish' events are).

PR-URL: https://github.com/nodejs/node/pull/25026
Fixes: https://github.com/nodejs/node/issues/24984


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>