InstantAnswer.pm - omit 'test' topic from IA Pages Index

@russellholt FirstGoodies and Is Awesome IAs will have the 'test' category, so that they can be easily hidden on the IA Pages Index.
I would obviously prefer to test this when the new metadata with the updated topics for those IAs will be available, but in the meantime I guarantee this at least doesn't break anything! :smile: 

Thanks @jbarrett for correcting my 'where' clause, I wouldn't have guessed the right syntax in a million years!
@russellholt https://metacpan.org/pod/SQL::Abstract#Complex-where-statements