Change PNDMPipeline to use PNDMScheduler (#2003)

* pndmpipeline uses pndmscheduler

* formatted pipeline_pndm

src/diffusers/pipelines/pndm/pipeline_pndm.py

@@ -39,6 +39,9 @@ class PNDMPipeline(DiffusionPipeline):
 
     def __init__(self, unet: UNet2DModel, scheduler: PNDMScheduler):
         super().__init__()
+
+        scheduler = PNDMScheduler.from_config(scheduler.config)
+
         self.register_modules(unet=unet, scheduler=scheduler)
 
     @torch.no_grad()