train.py: extract weights fixed (yay?)

Import missing libs.

rvc/train/train.py

@@ -43,7 +43,7 @@
     kl_loss,
 )
 from mel_processing import mel_spectrogram_torch, spec_to_mel_torch
-from process_ckpt import save_final
+from process_ckpt import *
 
 from rvc.lib.infer_pack import commons