test: change assert message to default

assert.strictEqual message argument removed to replace
with default assert message to show the expected vs
actual values

PR-URL: https://github.com/nodejs/node/pull/18259
Refs: https://github.com/nodejs/node/issues/13296


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>