An intialization promblem of fnn.embeddings with padding_idx 

### 🐛 Describe the bug

```
if module.padding_idx is not None:
     module.weight.data[module.padding_idx].zero_()
```
When module.padding_idx exist, the weight of embedding will initial to 0 since the padding_idx is incorrectly index to the fusion_B dimension.

### Versions / Dependencies

Pytorch 2.0