Don't error if wan concat image has extra channels.

comfy/model_base.py

@@ -1013,6 +1013,9 @@ class WAN21(BaseModel):
         if not self.image_to_video or extra_channels == image.shape[1]:
             return image
 
+        if image.shape[1] > (extra_channels - 4):
+            image = image[:, :(extra_channels - 4)]
+
         mask = kwargs.get("concat_mask", kwargs.get("denoise_mask", None))
         if mask is None:
             mask = torch.zeros_like(noise)[:, :4]