assert: fix strict regression

Using `assert()` or `assert.ok()` resulted in a error since a
refactoring.

Refs: https://github.com/nodejs/node/pull/17582

Backport-PR-URL: https://github.com/nodejs/node/pull/23223
PR-URL: https://github.com/nodejs/node/pull/17903
Refs: https://github.com/nodejs/node/pull/17582


Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>