Changes the ammo statistics of the MP40 to make it more distinct and the Sterling to reach a midpoint between the old and new versions

More specifically, the MP40 is changed to be closer to the Uzi in damage and ammo category, and magazine slightly lowered to 32

The Sterling is also given this ammo and damage range, in addition to a magazine size increase back to 34, with the attachments also back to increasing and decreasing by 10