assert: fix loose assert with map and set

There was an oversight when checking the possible loose comparisons.
This is now fixed by also accepting `''` instead of `0` or `false`.

PR-URL: https://github.com/nodejs/node/pull/22145


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>