Fix crash with composters

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java

@@ -73,6 +73,11 @@ public class DummyGeneratorAccess implements GeneratorAccessSeed {
         return TickListEmpty.emptyLevelList();
     }
 
+    @Override
+    public void scheduleTick(BlockPosition blockposition, Block block, int i) {
+        // Used by BlockComposter
+    }
+
     @Override
     public LevelTickAccess<FluidType> getFluidTicks() {
         return TickListEmpty.emptyLevelList();