test: remove eslint comments

This commit refactors test-whatwg-url-tojson.js to remove
ESLint comments.

PR-URL: nodejs#12669
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

test/parallel/test-whatwg-url-tojson.js

@@ -4,13 +4,11 @@ const common = require('../common');
 const URL = require('url').URL;
 const { test, assert_equals } = common.WPT;
 
-/* eslint-disable */
 /* WPT Refs:
    https://github.com/w3c/web-platform-tests/blob/02585db/url/url-tojson.html
    License: http://www.w3.org/Consortium/Legal/2008/04-testsuite-copyright.html
 */
 test(() => {
-  const a = new URL("https://example.com/")
-  assert_equals(JSON.stringify(a), "\"https://example.com/\"")
-})
-/* eslint-enable */
+  const a = new URL('https://example.com/');
+  assert_equals(JSON.stringify(a), '"https://example.com/"');
+});