I'm not sure why this was reworded but the new wording makes it sound like versatile weapons don't get the benefit of it at all. Moving the comma to a place that makes it sound like they're included ("that is not two-handed, or versatile in one hand and no weapon in the other") then sounds like non-versatile weapons don't get the benefit. If it's because versatile weapons can't be one-handed unless you have a shield or another weapon thanks to dual wielding then I think the best way to word it is instead to have that mentioned separately since it's a unique issue, something like "When wielding a melee weapon that is not Two-Handed and no weapon in the other, you deal an additional 2 damage with that weapon. Versatile weapons must be wielded with a shield to benefit from this feature."
