Incorrect image observations when multiple image modalities are requested

[RachithP]

Thanks to @quentin-leboutet for reporting this issue.

I'm just making a note of this issue on behalf of Quentin.

• Issue exists in v0.4.0 release.
• This can be reproduced with the generate_image_dataset example.

Steps to reproduce:

• Use multiple image modalities in your user_config.yaml, for eg., your config file should look something like this

  SIMULATION_CONTROLLER:
  CAMERA_AGENT:
  CAMERA:
    RENDER_PASSES: ["depth", "normal"] # "depth", "final_color", "normal", "segmentation"

• Run generate_images.py, and you can see incorrect image observations. Example of incorrect images is below

Incorrect	Correct