Support shouldn't have ammo boxes

Too many support are not playing support because they're running around shooting things, which comes naturally to whatever class that can replenish its own ammo. Assault should probably receive the ammo box, because it's the only class that, logically, needs it more than everyone else. There is only one reason to play Assault anyway, and that's the spawn beacon, which should probably be given to support since it makes more sense, imo. Could maybe just get rid of that stupid stim thing and just make that a timed ammo box drop.