test: remove eslint-disable from fixtures

Fixture files are not linted. Remove `eslint-disable` comments from
fixture files.

PR-URL: https://github.com/nodejs/node/pull/23345


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>