test: fix test-net-connect-econnrefused (again)

test-net-connect-econnrefused was recently fixed, but only in certain
circumstances. This change allows it to succeed whether it is invoked
with `node` or `tools/test.py`. Makes sure no Socket handles are left,
which is what the test is trying to determine, rather than failing if
there are no handles of any kind left.

PR-URL: https://github.com/nodejs/node/pull/25438


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>