Coordinate axes correct in validate camera FOV?

Confirm that x_pix/y_pix coordinate axes are correct.

Generated with:

```python src/simtools/applications/validate_camera_fov.py --config tests/integration_tests/config/validate_camera_fov_run.yml```

<img width="792" height="786" alt="Image" src="https://github.com/user-attachments/assets/4e5f4af4-c32c-4b52-8f65-ad24f7bf615d" />