fix: Stone drops cobblestone when mined

src/main/java/cz/jzitnik/game/entities/items/registry/blocks/StoneBlock.java

@@ -8,7 +8,7 @@ import cz.jzitnik.game.entities.items.ToolVariant;
 
 import java.util.Arrays;
 
-@BlockRegistry("stone")
+@BlockRegistry(value = "stone", drops = "cobblestone")
 public class StoneBlock extends Block {
     public StoneBlock() {
         super("stone", SpriteLoader.SPRITES.STONE, 15, ItemType.PICKAXE, Arrays.stream(ToolVariant.values()).toList());