Specifically states "if you revert as a result of dropping to 0 hit points, any excess damage carries over to your normal form." So the damage that is being taken goes to the other form specifically as you cannot actually be at 0 in wild shape. You are correct, very specific, it carries over to the normal form as stated to the specific state as a Druid. If the spell was less general and said "including wild shaped druids" then it would in fact be more specific that the wild shape verbiage.