chore:

- Extracted child style seed derivation to deriveChildStyleSeed

Ref.: https://github.com/VolmitSoftware/Iris/issues/1251

core/src/main/java/art/arcane/iris/generation/terrain/IrisDimensionCarvingEntry.java

@@ -83,8 +83,7 @@ public class IrisDimensionCarvingEntry {
     public CNG getChildrenGenerator(long seed, IrisData data) {
         return childGenerators.computeIfAbsent(deriveChildrenGeneratorSeed(seed), key -> {
             double scale = Math.max(0.0001D, getChildShrinkFactor());
-            RNG random = new RNG(key);
-            return getChildStyle().create(random.nextParallelRNG(2137), data).bake().scale(scale).bake();
+            return getChildStyle().create(deriveChildStyleSeed(key), data).bake().scale(scale).bake();
         });
     }
 
@@ -92,6 +91,10 @@ public class IrisDimensionCarvingEntry {
         return worldSeed ^ (hashOfId() << 32) ^ 2137L;
     }
 
+    static RNG deriveChildStyleSeed(long childrenGeneratorSeed) {
+        return new RNG(childrenGeneratorSeed).nextParallelRNG(2137);
+    }
+
     private long hashOfId() {
         String entryId = getId();
         return entryId == null ? 0L : entryId.trim().hashCode();