Search results call it devsys instead of system

[dfabulich]

I’m not sure why, but on the home page, in the games section, the live site shows authoring systems, but the dev site does not. This happens regardless of whether I set a filter.

This is because we're using searchutil to get the game data, but search results call it devsys instead of system. This PR updates the home page to look for devsys, bringing the system back on the home page.

https://github.com/iftechfoundation/ifdb/blob/c5bfed02e0f5016dc6a3a42d03b9d355184ce1a5/www/searchutil.php#L263