Fix Playlist id extraction when length is less than 34

Author: John Zhen M

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubePlaylistUrlIdHandler.java

@@ -8,7 +8,7 @@
 public class YoutubePlaylistUrlIdHandler implements UrlIdHandler {
 
     private static final YoutubePlaylistUrlIdHandler instance = new YoutubePlaylistUrlIdHandler();
-    private static final String ID_PATTERN = "([\\-a-zA-Z0-9_]{34})";
+    private static final String ID_PATTERN = "([\\-a-zA-Z0-9_]*)";
 
     public static YoutubePlaylistUrlIdHandler getInstance() {
         return instance;