SPIGOT-2789: ShulkerBox missing override

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

paper-server/src/main/java/org/bukkit/craftbukkit/block/CraftShulkerBox.java

@@ -1,6 +1,7 @@
 package org.bukkit.craftbukkit.block;
 
 import net.minecraft.server.BlockShulkerBox;
+import net.minecraft.server.TileEntity;
 import net.minecraft.server.TileEntityShulkerBox;
 import org.bukkit.DyeColor;
 import org.bukkit.Material;
@@ -29,6 +30,11 @@ public class CraftShulkerBox extends CraftLootable implements ShulkerBox {
         world = null;
     }
 
+    @Override
+    public TileEntity getTileEntity() {
+        return box;
+    }
+
     @Override
     public Inventory getInventory() {
         return new CraftInventory(box);