If ALLOW_DISABLED_PLAYER_INPUT is true (only ScreenTitleMenu), then
ScreenSelect::Input doesn't do JoinInput ("the player will be joined
and the user will still be on the title menu"). However,
ScreenSelectMaster::MenuStart does the JoinInput anyway, so this still
happens.
If we want to have main menu options that don't load a screen, this
code path should be refactored a bit, to ask the derived class whether
the selection should also join. As is, it's just making the JoinInput
path complicated.
Glenn Maynard
52009ae6ee