Brief description

Creating "Camera" subset was creating a new camera even when the user selects one before create action, ignoring Use Selection option.

Testing notes:

1. Create a new camera and select it.
2. From the menu OpenPype, select Create.
3. Select Camera family, keep the Use selection option ticked, and press Create.
4. It should add the previously created camera to the instance, and it shouldn't create any new camera.