Reworking Froglight drops: Color based on diet, not biomes.

I propose that the color of Froglights should be determined by what the frog eats (Common Slime, Sulfur Slime, or Magma Cube), rather than the frog's original biome. Justification: The current system is overly tedious. It is way too much work to collect and transport frogs from multiple distant biomes just to get different block colors. This slows down gameplay significantly and makes obtaining decorative blocks a chore. Switching the mechanic to depend on the slime type is better and more intuitive, allowing players to focus on resource gathering instead of the frustrating task of moving mobs across vast distances.