Fix creature corpse teleport during removal

[MadMaxMangos]

Summary

Fixes a creature corpse visibility issue where corpses could appear to snap or reappear at their respawn point during corpse cleanup.

Creature::RemoveCorpse() relocates the creature to its respawn coordinates before forcing corpse-removal visibility. The follow-up UpdateObjectVisibility() after restoring visibility could recreate the still-dead object for clients at the respawn position.

This removes that second visibility update while keeping the internal relocation required for respawn/grid state.

This also mitigates the known creature level-up visual/sound artifact for normal players during respawn, because the corpse/object is no longer recreated through the extra visibility update before the live respawn.

Behavior

Before:

• Creature dies away from spawn.
• Corpse remains at death location.
• On corpse cleanup, corpse can visibly appear/snap to the spawn point.
• Creature later respawns alive at spawn.

After:

• Creature dies away from spawn.
• Corpse despawns for normal players without visible teleport.
• Creature still respawns alive at the correct spawn point.

Testing

Verified locally:

• World creature corpse decay.
• Manual .die + .respawn.
• Automatic respawn at the expected spawn point.
• Normal-player visibility with GM mode off.
• Stockades instance trash respawn.
• Level-ranged respawn changed level without visible level-up effect for a normal player view.

Notes

• GMs with .gm on may still observe the hidden corpse/object state at the respawn point. Normal players do not see the corpse teleport/reappear.
• This also mitigates the known client-side creature level-up visual/sound artifact during normal respawn. In testing, a level-ranged creature changed level on respawn without playing the player-style level-up effect. The root cause remains a client-side deferred-destroy/reuse-by-GUID behavior, so this PR describes it as a mitigation rather than a global client fix.

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✅ Build Mangos ZERO Server 22.04.310-kefcqxtk completed (commit bac0908523 by @MadMaxMangos)