SEW - Masked Spec errors out in training
To reproduce:

```python
#!/usr/bin/env python3
from transformers import AutoModelForCTC
import torch

model = AutoModelForCTC.from_pretrained("asapp/sew-small-100k", mask_time_prob=0.2).train()

model(torch.tensor([10000 * [1.0]]))
```
Issue is related to the missing projection layer, resolved by https://github.com/huggingface/transformers/pull/14158