Add custom min_hunts field to attractions.php

[AardWolf]

Recently a filter for min_hunts was added to searchByItem.php but attractions.php will not pass this along if we set it in the url.

It looks like 100 is hard-coded.

[logicalup]

It's hardcoded in attractions page. It's not hardcoded in the api endpoint that everyone else should be using (searchby...). If we want people to change it from attractions page, i suggest we add a text/numeric field to make it obvious (instead of url)