Add maxDam for medium velocity wounds

Ensures that velocity wounds from a major hit will use the "Large" type
of wound

addons/medical/ACE_Medical_Treatments.hpp

@@ -590,6 +590,7 @@ class ACE_Medical_Advanced {
                 class Medium {
                     name = CSTRING(Wounds_VelocityWound_Medium);
                     minDamage = 0.3;
+                    maxDamage = 0.75;
                     bleedingRate = 0.05;
                 };
                 class Large {