assert: throw without args in ok

`assert.ok()` should always receive a value. Otherwise there
might be a bug or it was intended to use `assert.fail()`.

PR-URL: https://github.com/nodejs/node/pull/17581


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ron Korving <ron@ronkorving.nl>