cross-origin props do not work

[Johan Steyn]

Describe the bug
Trying to set cross-origin=anonymous doesn't work at all. The img doesn't have the property so we can not crop S3 bucket images.

To Reproduce
Steps to reproduce the behaviour:

1. Use any image from another origin that has the correct headers (Access-Control-Allow-Origin: *) or an S3 image.
2. Try to crop an image and save it.

Expected behaviour
The image should crop.

Screenshots

Additional context
By manually adding the correct attributes to the img it does work. But the prop to control it on a plugin level doesn't work