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>

test/fixtures/guess-hash-seed.js

@@ -1,4 +1,3 @@
-/* eslint-disable required-modules */
 'use strict';
 function min(arr) {
   let res = arr[0];

test/fixtures/inspector-global-function.js

@@ -1,4 +1,4 @@
-'use strict'; // eslint-disable-line required-modules
+'use strict';
 let invocations = 0;
 const interval = setInterval(() => {}, 1000);