Fix BGR/RGB mixup in colmap demo (#2430)

### What
Bug introduced in #2418

It's back to being red:

![image](https://github.com/rerun-io/rerun/assets/1148717/9ce4ab6b-a782-4b0d-9f75-2c905bf3313e)


### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)

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PR Build Summary: https://build.rerun.io/pr/2430

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Docs preview: https://rerun.io/preview/df06d4c/docs
Examples preview: https://rerun.io/preview/df06d4c/examples
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examples/python/colmap/main.py

@@ -158,9 +158,10 @@ def read_and_log_sparse_reconstruction(dataset_path: Path, filter_output: bool,
         )
 
         if resize:
-            img = cv2.imread(str(image_file))
-            img = cv2.resize(img, resize)
-            rr.log_image("camera/image", img, jpeg_quality=75)
+            bgr = cv2.imread(str(image_file))
+            bgr = cv2.resize(bgr, resize)
+            rgb = cv2.cvtColor(bgr, cv2.COLOR_BGR2RGB)
+            rr.log_image("camera/image", rgb, jpeg_quality=75)
         else:
             rr.log_image_file("camera/image", img_path=dataset_path / "images" / image.name)