Add the HK-416 or the MP5SD as the primary to custom classes.#961

As the title suggests change the ak-47 into the MP5SD or the HK-416 as they would be a better choice as a primary. Custom class hitboxes already put us as a disadvantage it would be nice to have a good weapon.

m9k ak47 does the same/better damage than 75% of the perma aks