fix: double death bug at duel arena

[tannerdino]

For 225+

How to recreate:

• Take damage to 0 hp
• Eat food next tick (same tick as death)
• Take poison damage (same tick as death)

Fixed by adding combat_clearqueue to player_death_duel label... But I think its due a rewrite at some point. The duel_finish queue was coded to try to reproduce the double Oh dear you are dead! mes authentic bug, but Im starting to think thats not how the double mes bug worked - need to figure this out sometime.

Before:

2026-05-11.12-13-07.mp4

After:

2026-05-11.12-19-49.mp4