Resolved Fix dispenser glitch on Super Zombie Fortress

[Bigunit]

The problem is: Dispensers are designed to act as walls/shield, but when engineer builds his dispenser and then replace it, it's starting to work as the normal dispenser, giving ammo and health on contact, making this class super unbalanced and impossible to kill survivors due they can non-stop spam and do not worry about wasting ammo and receiving health, tanking incoming zombies.