fix a mistake in text2image training script for kandinsky2.2 (#5244)

fix
Co-authored-by: yiyixuxu <yixu@Yis-MacBook-Pro.local>

examples/kandinsky2_2/text_to_image/train_text_to_image_lora_prior.py

@@ -682,7 +682,7 @@ def main():
                 # Backpropagate
                 accelerator.backward(loss)
                 if accelerator.sync_gradients:
-                    accelerator.clip_grad_norm_(prior.parameters(), args.max_grad_norm)
+                    accelerator.clip_grad_norm_(lora_layers.parameters(), args.max_grad_norm)
                 optimizer.step()
                 lr_scheduler.step()
                 optimizer.zero_grad()