Fix leafweb-vision: patch cv2.destroyAllWindows via sed at startup

opencv-python-headless swap doesn't override conda's cv2. Instead,
sed-patch the one offending line in streamlit_inference.py directly.

leafweb-vision/docker-compose.yml

@@ -3,7 +3,7 @@ services:
     image: ultralytics/ultralytics:latest
     container_name: leafweb-vision
     restart: unless-stopped
-    command: bash -c "pip install 'streamlit>=1.29.0' opencv-python-headless -q --root-user-action=ignore && pip uninstall opencv-python -y -q 2>/dev/null; yolo solutions inference"
+    command: bash -c "pip install 'streamlit>=1.29.0' -q --root-user-action=ignore && sed -i 's/cv2.destroyAllWindows().*$/pass  # cv2.destroyAllWindows() disabled in headless/' /ultralytics/ultralytics/solutions/streamlit_inference.py && yolo solutions inference"
     ports:
       - "8501:8501"
     volumes: