Core/Vehicles: Also remove mount auras for passengers not in charm seat

May fix related crashes:
Ref #9256 #9255

src/server/game/Entities/Vehicle/Vehicle.cpp

@@ -741,6 +741,7 @@ bool VehicleJoinEvent::Execute(uint64, uint32)
     }
 
     Passenger->InterruptNonMeleeSpells(false);
+    Passenger->RemoveAurasByType(SPELL_AURA_MOUNTED);
 
     Player* player = Passenger->ToPlayer();
     if (player)