Core/AI: call ModifyVehiclePassengerExitPos for CreatureScripts since the hook is available for that class as well

Port From (https://github.com/TrinityCore/TrinityCore/commit/64fc549be83a2be920c969c11ec20d3f2a2c8e85)

Source/Game/Scripting/CoreScripts.cs

@@ -335,6 +335,9 @@ namespace Game.Scripting
 
         public override bool IsDatabaseBound() { return true; }
 
+        // Called when an unit exits a vehicle
+        public virtual void ModifyVehiclePassengerExitPos(Unit passenger, Vehicle vehicle, Position pos) { }
+
         // Called when a CreatureAI object is needed for the creature.
         public virtual CreatureAI GetAI(Creature creature) { return null; }
     }

Source/Game/Scripting/ScriptManager.cs

@@ -1105,6 +1105,7 @@ namespace Game.Scripting
         public void ModifyVehiclePassengerExitPos(Unit passenger, Vehicle vehicle, Position pos)
         {
             ForEach<UnitScript>(p => p.ModifyVehiclePassengerExitPos(passenger, vehicle, pos));
+            ForEach<CreatureScript>(p => p.ModifyVehiclePassengerExitPos(passenger, vehicle, pos));
         }
 
         // AreaTriggerEntityScript