Core/Unit: Fix respawning after ForceDespawn is called.

src/server/game/Entities/Unit/Unit.cpp

@@ -12726,6 +12726,7 @@ void Unit::setDeathState(DeathState s)
         GetMotionMaster()->Clear(false);
         GetMotionMaster()->MoveIdle();
         StopMoving();
+        DisableSpline();
         // without this when removing IncreaseMaxHealth aura player may stuck with 1 hp
         // do not why since in IncreaseMaxHealth currenthealth is checked
         SetHealth(0);