[Fix]: fix key error (#2085)

Author: Xiangxu-0103

mmdet3d/models/data_preprocessors/data_preprocessor.py

@@ -88,7 +88,7 @@ def __init__(self,
                  rgb_to_bgr: bool = False,
                  boxtype2tensor: bool = True,
                  batch_augments: Optional[List[dict]] = None) -> None:
-        super(Det3DDataPreprocessor).__init__(
+        super(Det3DDataPreprocessor, self).__init__(
             mean=mean,
             std=std,
             pad_size_divisor=pad_size_divisor,