Fix chromatic compound not working under y0 (#6227)

* Fix chromatic compound not working under y 0

* Switch away from constant

Author: IThundxr

src/main/java/com/simibubi/create/content/legacy/ChromaticCompoundItem.java

@@ -133,7 +133,7 @@ public boolean onEntityItemUpdate(ItemStack stack, ItemEntity entity) {
 		BlockPos.MutableBlockPos testPos =
 			new BlockPos.MutableBlockPos(entityX, Math.min(Mth.floor(entity.getY()), localWorldHeight), entityZ);
 
-		while (testPos.getY() > 0) {
+		while (testPos.getY() > minHeight) {
 			testPos.move(Direction.DOWN);
 			BlockState state = world.getBlockState(testPos);
 			if (state.getLightBlock(world, testPos) >= 15 && state.getBlock() != Blocks.BEDROCK)