Fix custinfoparms

[robo9k]

World of Padman uses special surface flags (carpetsteps, latticesteps etc.).
This requires either a game definition (e.g. game_wop.h) for q3map2 or using the -custinfoparms switch (see default_build_menu.xml). If using the switch, q3map2 parses a scripts/custinfoparms.txt from the configured VFS.

For some reason a default installation of World of Padman does not include custinfoparms.txt, and therefor it was added to WoPPack in 3a66043 and 469d0df.

The best fix would most likely be the inclusion of custinfoparms.txt in the default World of Padman installation (pinging upstream @worldofpadman), which in turn would require a new (patch) release, which is unlikely.