Tweak Id3Decoder error message to print hex instead of int

Before: "Unexpected first three bytes of ID3 tag header: 6845556"
After: "Unexpected first three bytes of ID3 tag header: 0x687474"
PiperOrigin-RevId: 271949486

library/core/src/main/java/com/google/android/exoplayer2/metadata/id3/Id3Decoder.java

@@ -163,7 +163,7 @@ public final class Id3Decoder implements MetadataDecoder {
 
     int id = data.readUnsignedInt24();
     if (id != ID3_TAG) {
-      Log.w(TAG, "Unexpected first three bytes of ID3 tag header: " + id);
+      Log.w(TAG, "Unexpected first three bytes of ID3 tag header: 0x" + String.format("%06X", id));
       return null;
     }