Wav2Vec2ForPreTraining loss Nan fixed
# What does this PR do?

- [ ] This PR fixe the  loss of   [Wav2Vec2ForPreTraining](https://huggingface.co/docs/transformers/v4.21.3/en/model_doc/wav2vec2#transformers.Wav2Vec2ForPreTraining) which  return Nan values .

- [ ] We fix the error by adding sampled_negative_indices as a target to calculate the loss .
