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The Camera display in RViz shows just what the image stream contains (which in this case is upside-down), plus other 3D data if the alpha is less than 1.0, as Felix mentions. That way you can see the other 3D data upside-down as well.

If you want the image stream to be rotated so that it's "up" vector matches your own personal "up" vector, you need to have a ROS node subscribe to the image stream, rotate it, and re-publish it. The image_rotate package has a node for this.