Bug in create panoptic segmentation

L119 @ preparation/createPanopticImgs.py , master
```python
                mask = originalFormat == segmentId
                color = [segmentId % 256, segmentId // 256, segmentId // 256 // 256]
                pan_format[mask] = color
```

color should be fix to:

```python
color = [segmentId % 256, ( segmentId // 256 ) % 256, segmentId // 256 // 256]
```