Fix issue 30 - testing value of `hash-table-size`.

As far as I can tell from the spec, the meaning of hash-table-size is not dictated, and implementations are free to return just about anything; it's just a way to provide useful information (hints) when creating a new hash-table.

I disabled this test on Allegro originally, but Attila Lendvai proposes we simply remove it altogether, as this commit does.