Fix spawn eggs with no entity creating invalid stacks and disconnect creative clients

Example: /give @s minecraft:cat_spawn_egg[minecraft:max_stack_size=1,minecraft:max_damage=100,minecraft:damage=10] 1

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

paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSpawnEgg.java

@@ -151,10 +151,6 @@ public class CraftMetaSpawnEgg extends CraftMetaItem implements SpawnEggMeta {
     void applyToItem(CraftMetaItem.Applicator tag) {
         super.applyToItem(tag);
 
-        if (!isSpawnEggEmpty() && entityTag == null) {
-            entityTag = new NBTTagCompound();
-        }
-
         if (entityTag != null) {
             tag.put(ENTITY_TAG, CustomData.of(entityTag));
         }