test: remove third param from assert.strictEqual

Removing third argument in calls to assert.strictEqual() so that the
values of the first two arguments are shown instead as this is more
useful for debugging.

Refs: https://nodejs.org/api/assert.html#assert_assert_strictequal_actual_expected_message

PR-URL: https://github.com/nodejs/node/pull/19536


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>