Upgrading to lookup.uris (no singular uri argument any more); Immutable add_uris prevents track disappearing from lists

src/js/services/mopidy/actions.js

@@ -429,7 +429,7 @@ export function clearLibraryArtists() {
 export function getArtist(uri) {
   return {
     type: 'MOPIDY_GET_ARTIST',
-    data: { uri },
+    uri,
   };
 }