fix: delete loader thread on *music stop and disconnect

src/main/java/me/chayapak1/chomens_bot/commands/MusicCommand.java

@@ -224,6 +224,7 @@ public class MusicCommand extends Command {
         final Bot bot = context.bot;
         bot.music.stopPlaying();
         bot.music.songQueue.clear();
+        bot.music.loaderThread = null;
 
         return Component.text("Cleared the song queue").color(ColorUtilities.getColorByString(bot.config.colorPalette.defaultColor));
     }

src/main/java/me/chayapak1/chomens_bot/plugins/MusicPlayerPlugin.java

@@ -369,6 +369,7 @@ public class MusicPlayerPlugin extends Bot.Listener implements CorePlugin.Listen
     @Override
     public void disconnected (DisconnectedEvent event) {
         if (currentSong != null) currentSong.pause(); // nice.
+        loaderThread = null;
     }
 
     public void handlePlaying () {