Auto select filter based on initial install results

[MjnMixael]

Putting this here so we don't forget to discuss it when Filters are implemented.

After a user finishes the Welcome Wizard, we should auto-select the appropriate filter for when they land on the Explore tab. To be clear these would just be initial default filters. The idea is the show the player FSO games they can play RIGHT MEOW. They can obviously change the filter to whatever they want at any time.

FS2 Installed -> no filter FS2 Not Installed -> TCs only