Core/SmartAI: Implement SMART_TARGET_VEHICLE_ACCESSORY

By Malcrom

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -3120,6 +3120,14 @@ ObjectList* SmartScript::GetTargets(SmartScriptHolder const& e, Unit* invoker /*
                 }
             }
         }
+        case SMART_TARGET_VEHICLE_ACCESSORY:
+        {
+            if (me && me->IsVehicle())
+            {
+                if (Unit* target = me->GetVehicleKit()->GetPassenger(e.target.vehicle.seat))
+                    l->push_back(target);
+            }
+        }
         case SMART_TARGET_POSITION:
         case SMART_TARGET_NONE:
         default: