TqdmCallback: fix typo/off-by-one error (#277)

`self.tqdm` should be set if progress_bar is passed.

Author: skshetry

src/dvc_objects/fs/callbacks.py

@@ -41,11 +41,10 @@ def __init__(
         from dvc_objects._tqdm import Tqdm
 
         tqdm_kwargs.pop("total", None)
-        tqdm_cls = tqdm_cls or Tqdm
         super().__init__(
-            tqdm_kwargs=tqdm_kwargs, tqdm_cls=tqdm_cls, size=size, value=value
+            tqdm_kwargs=tqdm_kwargs, tqdm_cls=tqdm_cls or Tqdm, size=size, value=value
         )
-        if progress_bar is None:
+        if progress_bar is not None:
             self.tqdm = progress_bar
 
     def branched(self, path_1: "Union[str, BinaryIO]", path_2: str, **kwargs):