Allow Sulfur Cubes to keep their AI

Sulfur Cubes are an amazing idea, but I feel like taking away their AI when they absorb a block makes them too niche. I think they should keep their AI when they absorb a block and get the properties of the block they absorb the same way they do right now, but applied to their normal bouncing behaviour. Then, we can wax them to lock them in place and remove their AI.