17 Pounder and 6 Pounder APDS Accuracy buff

[Enfield-303]

17 and 6 Pounder APDS was incredibly inaccurate to the point of being useless, both should have a 1/2 chance to hit a frontal panthers turret at 400 yards, spread was 0.006 for the 17pdr and 0.048 for the 6pdr, both have been changed to 0.002 which is more in line with the relevant data.