Partially implement SCE_UTILITY_SAVEDATA_FOCUS_NAME

This makes Tales of Phantasia X behave correctly. It passes a wildcard to this function right after boot ("-P*" instead of the usual "-PXX"), which isn't handled. I'm not sure what it tries to do with that though. It defaults to 0 if no match is found, so in the worst case it doesn't behave worse than before.