Fixing a projectile-related issue

Created by: DeityLink

Projectiles with a penetration value of -1 (or any negative value) are meant to be able to keep going through obstacles indefinitely. The only projectile that currently makes use of this is the OSIPR's dark energy balls, however I recently noticed that they disappeared after moving through only one obstacle. Turns out that when I revamped projectile penetrations when I added the Hecaté I forgot to include an exception for projectiles with negative penetration, which caused the penetration to default back to 0 after going through any obstacle.