Fix formatting in create_new_dataset_json by removing unnecessary blank line

Author: SimoneBendazzoli93

monai/apps/nnunet/utils.py

@@ -160,7 +160,7 @@ def create_new_dataset_json(
     new_json_data["labels"]["background"] = 0
     for _j in range(num_foreground_classes):
         new_json_data["labels"][f"class{_j + 1}"] = _j + 1
-        
+
     # new_json_data["numTraining"] = len(datalist_json["training"])
     new_json_data["numTraining"] = num_training_data
     new_json_data["file_ending"] = ".nii.gz"