Attempt to fix compat with the new youtube source

Author: duncte123

application/src/main/java/me/duncte123/lyrics/HttpClientProvider.java

@@ -32,7 +32,10 @@ public HttpClientProvider(AbstractRoutePlanner routePlanner, ServerConfig server
                 rotator = new YoutubeIpRotatorSetup(routePlanner).withRetryLimit(retryLimit);
             }
 
-            rotator.forConfiguration(this.httpInterfaceManager, false).setup();
+            rotator.forConfiguration(this.httpInterfaceManager, false)
+                   // Necessary to avoid NPEs.
+                   .withMainDelegateFilter(null)
+                   .setup();
         }
     }
 

application/src/main/java/me/duncte123/lyrics/LyricsClient.java

@@ -1,6 +1,5 @@
 package me.duncte123.lyrics;
 
-import com.sedmelluq.discord.lavaplayer.source.youtube.YoutubeAudioTrack;
 import com.sedmelluq.discord.lavaplayer.tools.JsonBrowser;
 import com.sedmelluq.discord.lavaplayer.tools.io.HttpInterface;
 import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
@@ -47,8 +46,8 @@ public Future<Lyrics> findLyrics(AudioTrack track) {
         try {
             final String videoId;
 
-            if (track instanceof YoutubeAudioTrack ytTrack) {
-                videoId = ytTrack.getInfo().identifier;
+            if ("youtube".equalsIgnoreCase(track.getSourceManager().getSourceName())) {
+                videoId = track.getInfo().identifier;
             } else if (track.getInfo().isrc != null) {
                 // So, turns out that yt needs the ISRC in quotes. Whoops
                 final var searched = search(