Make SD3 empty latent image zeros.

This shouldn't change anything. The reason it was not zeros is because it
did matter in early versions of the code.

comfy_extras/nodes_sd3.py

@@ -36,7 +36,7 @@ def INPUT_TYPES(s):
     CATEGORY = "latent/sd3"
 
     def generate(self, width, height, batch_size=1):
-        latent = torch.ones([batch_size, 16, height // 8, width // 8], device=self.device) * 0.0609
+        latent = torch.zeros([batch_size, 16, height // 8, width // 8], device=self.device)
         return ({"samples":latent}, )
 
 class CLIPTextEncodeSD3: