test: fixup failing test/internet/test-dns.js

The `ttl` for the `nodejs.org` DNS record is returning `0`
currently. The test checks for `> 0`, causing the test to
fail.

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/38241


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>