Rename Netherite Scrap to Ancient Scrap

Ancient debris and netherite are two different things. Ancient debris is the stuff you find in veins throughout the nether, and netherite is what you get when you combine ancient debris with gold. Netherite scrap, as it is currently called, is not actually netherite yet, as it has not been combined with gold, so it should just be called "ancient scrap", as it comes from ancient debris.