test: refactor test-net-dns-error

- Use `common.mustCall()` and `common.mustNotCall()`.
- Use ternary operator.

PR-URL: https://github.com/nodejs/node/pull/19640


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>