Also sort playlist duplicates by display index

app/src/main/java/org/schabi/newpipe/database/playlist/dao/PlaylistStreamDAO.java

@@ -154,6 +154,6 @@ public interface PlaylistStreamDAO extends BasicDAO<PlaylistStreamEntity> {
             + " AND :streamUrl = :streamUrl"
 
             + " GROUP BY " + JOIN_PLAYLIST_ID
-            + " ORDER BY " + PLAYLIST_NAME + " COLLATE NOCASE ASC")
+            + " ORDER BY " + PLAYLIST_DISPLAY_INDEX)
     Flowable<List<PlaylistDuplicatesEntry>> getPlaylistDuplicatesMetadata(String streamUrl);
 }