Add dm63 to the SPz 12-3 LGS

The auto cannon is at 6.7 next to useless. It should get dm63 which would make it a little bit better.
It doesn’t have the mobility to flank most of the time. Dm63 would be a great QOL feature for this tank.
Sub 1-2 at 5.3 has dm63 aswell. It’s nothing you would only find at 8.0 with the marder 1A3