asset.cpp: Always point to GfLocalDir

Now that tracks and cars can also be loaded from GfLocalDir(), the
in-game download manager must only use this directory since write
permissions are not guaranteed on GfDataDir().

src/modules/userinterface/legacymenu/mainscreens/asset.cpp

@@ -89,17 +89,7 @@ std::string Asset::path() const
 
 std::string Asset::basedir() const
 {
-    switch (type)
-    {
-        case Asset::car:
-        case Asset::track:
-            return GfDataDir();
-
-        case Asset::driver:
     return GfLocalDir();
-    }
-
-    return "";
 }
 
 std::string Asset::dstdir() const