Make face aligment optional

[roperi]

It would be nice to have a way to turn off the face aligment to avoid using padding. Especially good for training models where the position of the face/body is not important.

[roperi]

For example, fine-tuning of pre-trained diffusion models where you actually want to preserve face or body position.

[mantasu]

Yes, thanks for this! Will consider in v1.2