I apologise as there is no provision to reverse any image.
I noticed that this same problem has happened to many people. Adobe should have a confirmation dialogue or something to prevent this. Especially since you have the pop up on search screen that if you hover over an image you can license it without even opening the image. This is what happened to me. I went to click on the image and right when I did the popup appeared and I accidentally licensed it.
I've granted you an additional license for the accidental licensing. Our engineering team is aware that this is an issue for many customers and are working on a solution.