UX: add unlink button, simplify unlink code

src/Logic/ImageProviders/WikidataImageProvider.ts

@@ -61,7 +61,11 @@ export class WikidataImageProvider extends ImageProvider {
             allImages.push(promises)
         }
         const resolved = await Promise.all(Utils.NoNull(allImages))
-        return [].concat(...resolved)
+        const flattened = resolved.flatMap( x => x)
+        if(flattened.length === 1){
+            flattened[0].originalAttribute = {key, value}
+        }
+        return flattened
     }
 
     public DownloadAttribution(): Promise<undefined> {