validators: do not find best media for duplicate images

Author: iparamonau

lib/plugins/validators/sync/15_duplicateLink.js

@@ -70,8 +70,7 @@ export default {
         var storedLink = linksHrefDict[linkNoProtocol];
 
         if (storedLink) {
-
-            if (!storedLink.options && !link.options) {
+            if (!storedLink.options && !link.options && !/^image\//.test(link.type)) {
                 var media = findBestMedia(link.media, storedLink.media);
                 if (media) {
                     // Keep stored link. Update with better media.