FFHQ pretrained weights name change

[liordvir]

The pretrained .pt file you provided is named ffhq_10m.pt, However, the script prox_diffpir_poisson.py expects the hard-coded name diffusion_ffhq_10m.pt. (The UNET initialization line checks this)

Of course, changing the name is trivial, but it would be helpful if the names match right out of the gate.

Thank you.