Fix 9040 Bills missile launcher

The missile leuncher of strv 9040Bill is always going down while moving which is straight up stupid and possibly its not even a thing to close the barrell while heading toward to a enemy territory and when a enemy target shows up you have to activate it, so what you do? you tell the enemy to pause the fire wait a bit because you dont have the atgm launcher deployed… fix it gaijin i just died now because of that stupid nonsense