EnhancedCraft

This is a minor hotfix to fix a few bugs associated with the 1.20.1 port.

• Fixed an issue where the armor texture for Alloy was mixed with Aecoron.
• Fixed an issue where the armor texture for Copper was missing.
• Lowered spawn rates for harder Zombies, Skeletons, and Status-Effect Spiders in Hard Difficulty.
• Fixed an issue where the Invisible Spider in Hard Difficulty showed it's Invisibility effect particles.