I have replaced the minimap with the image from v1.1, I assume it is much the same. The ingame version will have worked already, this just affects the thumbnail on website and in lobby. Cached versions of the old minimap may still persist in both until you clean the respective caches.

(If there is some meaningful difference in the minimaps, it is possible to replace the website/lobby image with an image you provide of the correct dimensions and file type. Download the existing image from website to determine what this is.)