[music] remove hardcoded track name in M3UDownloader

app/src/main/java/ru/vtosters/lite/music/M3UDownloader.java

@@ -14,6 +14,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 import javax.crypto.NoSuchPaddingException;
 
+import bruhcollective.itaysonlab.libvkx.client.LibVKXClient;
 import java8.util.concurrent.CompletableFuture;
 import okhttp3.Call;
 import okhttp3.OkHttpClient;
@@ -65,7 +66,8 @@ public class M3UDownloader implements ITrackDownloader {
         var tsesDir = new File(outDir, String.valueOf(payload.hashCode()));
         tsesDir.mkdirs();
         var resultTs = new File(tsesDir, "result.ts");
-        var resultMp3 = new File(outDir, "track.mp3");
+        var fileName = IOUtils.getValidFileName((cache ? LibVKXClient.asId(track) : track.toString()) + ".mp3");
+        var resultMp3 = new File(outDir, fileName);
 
         callback.onProgress(5);
         for (TransportStream ts : tses) {