Fix loot tables being reset before death event

[roro1506HD]

Using the following listener, the logged loot table currently matches the default loot table of the entity, not the actual loot table used:

    @EventHandler
    public void onEntityDeath(EntityDeathEvent event) {
        if (event.getEntity() instanceof Mob mob) {
            this.getSLF4JLogger().warn("Entity {} died with loot table: {}", mob.getName(), mob.getLootTable());
        }
    }

During my test, the Pig I modified did drop rotten flesh despite the console printing entities/pig loot table

[02:11:45 INFO]: roro1506_HD issued server command: /data merge entity 62185aec-e858-4945-a41a-6e21107085b7 {DeathLootTable:"minecraft:entities/zombie"}
[02:11:45 INFO]: [roro1506_HD: Modified entity data of Pig]
[02:11:47 WARN]: [Paper-Test-Plugin] Entity Pig died with loot table: minecraft:entities/pig

This PR fixes this issue

[16:12:32 INFO]: roro1506_HD issued server command: /data merge entity c3c71d92-632f-49d3-a682-fd062b85f884 {DeathLootTable:"minecraft:entities/zombie"}
[16:12:32 INFO]: [roro1506_HD: Modified entity data of Pig]
[16:12:34 WARN]: [Paper-Test-Plugin] Entity Pig died with loot table: minecraft:entities/zombie

Also addresses the issue where loot tables were being reset even when the EntityDeathEvent was being cancelled

[Doc94]

Tested with /summon pig ~ ~ ~ {DeathLootTable:"minecraft:entities/zombie"} and the entity in event show the loot table to being use.
Also for the cancel state the entity keep the loottable.