Fix vehicle stacking (no more pyramids for you!)

--HG--
branch : trunk

src/game/Unit.cpp

@@ -15835,6 +15835,7 @@ void Unit::EnterVehicle(Vehicle *vehicle, int8 seatId)
 
     if (GetTypeId() == TYPEID_PLAYER)
     {
+        this->ToPlayer()->InterruptNonMeleeSpells(false);
         this->ToPlayer()->StopCastingCharm();
         this->ToPlayer()->StopCastingBindSight();
         this->ToPlayer()->Unmount();