[AppDB] Fix make_cat_path() design (with patch this time)

[Paul van Schayck]

Function was checking globals when it really shouldn't. Check this
page. You're viewing a simple category but the category path at the
top shows an application:
http://appdb.winehq.org/appbrowse.php?catId=82&appId=1166

Changelog:
Let make_cat_path() make use of arguments instead of globals.
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