Update mission_models.py

mission_models.py

@@ -141,7 +141,7 @@ class ObjectDetector(MissionModel):
             
             # Smart Selection: If 'world' is requested, use YOLO-World
             if self.model_type == "world":
-                filename = "yolov8s-world.pt"
+                filename = "yolov8n-world.pt"
             else:
                 filename = f"yolov8{self.model_type}.pt"