Fix a crash when starting a song from the command line.

It still doesn't do the right thing, but at least it doesn't crash now.
SongChoosingScene seems to be getting confused as to what is expected
of it.

src/FoFiX.py

@@ -199,12 +199,10 @@ def main():
     if part is not None:
       engine.cmdPart = int(part)
     #evilynux - Multiplayer and mode selection support
-    Config.set("game", "players", nbrplayers)
     if nbrplayers == 1:
-      Config.set("game", "game_mode", mode)
+      engine.cmdMode = nbrplayers, mode, 0
     else:
-      Config.set("game", "game_mode", 0)
-      Config.set("game", "multiplayer_mode", mode)
+      engine.cmdMode = nbrplayers, 0, mode
 
   encoding = Config.get("game", "encoding")
   if encoding is not None: