Swap the underwater functions of magma and soul sand/soil

I think that the two currently are kind of backwards. Realistically, water bubbles would rise UP from magma, rather than going down. Plus, if soul sand pulled air bubbles down it would reflect how it pulls the player down into the sand and slows them when they're on it. And I know that part of the reason was to create a water hazard for boats, so to maintain that you could instead have it give boats a chance to capsize if they sit on it too long.