UNITY: Fix get images from multiple drones: simGetImages() was only retur…

[shabpompeiano]

…ning images for one drone when asking for images from multiple drones

Fixes: #

About

UNITY: The call to the api getSimImages() through Python was returning images only from one drone even in a multi-drone setting. The reason is that when doing SetUpCameras() only the cameras of one drone were added.

How Has This Been Tested?

Running the example script multi_agent_drone.py it was not that clear from which drone were the images captured coming from. After testing by adding different shapes in front of the capturing cameras (cam "0" and cam "1") I realized that they were coming only from one drone.

Screenshots (if appropriate):

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[shabpompeiano]

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[sandilyasg]

@shabpompeiano I made the changes in your PR in my local file, and it fixed the issue with getting multiple drones' RGB image frames, but the issue with the getting the depth frame and semantic segmentation frame from multiple drones remains the same -- it is coming from only one of the drones. Can you please give some guidance on how to fix this?