Better Terrain Addon 3.2.1

• Changed grassy clay to behave like regular grass blocks. It can spread grass, grass can spread to dirt clay blocks, and animals can eat grassy clay.
• Changed how grassy clay renders to only render clay in the dirt instead of in the grass as well.
• Removed the grassy clay overlay texture as it is no longer used.
• Fixed an issue where mahogany trees try to generate with mahogany wood instead of jungle wood without deco installed, crashing the game.