Properly return installed games on Windows

[AmineI]

Fixes #17 .

As mentioned there, I kept the original function structure and return values (ie get_registry_values returns a dict of installed games only, even though the registry contains uninstalled game keys.) , but the name is a bit confusing considering what the function actually does.

If it seems good to you, I'd recommend refactoring get_registry_values to actually return a dict of all Steam registry values, differently on Windows and Linux. Then a get_installed_games function would call get_registry_values and filter the dict of games, keeping only the installed ones. That should improve clarity and also reduce a bit the amount of code to maintain differently between Windows and Linux.

Just a suggestion of course, no worries if you feel like it's fine as it is :)

[aanderse]

I can't test, but nothing jumps out as out of place... I'm certain all the Windows users appreciate you fixing this!

[AmineI]

I can't test, but nothing jumps out as out of place... I'm certain all the Windows users appreciate you fixing this!

I did check on my end before submitting the PR, so it should be good to go, but I'll stay around in case it was one of those "It works on my machine" type of issues ;) .