Existence check for hparams now uses underlying filesystem (#5250)

Co-authored-by: Rohit Gupta <rohitgr1998@gmail.com>
(cherry picked from commit 410d67fbe8)

pytorch_lightning/loggers/tensorboard.py

@@ -218,7 +218,7 @@ class TensorBoardLogger(LightningLoggerBase):
         hparams_file = os.path.join(dir_path, self.NAME_HPARAMS_FILE)
 
         # save the metatags file if it doesn't exist
-        if not os.path.isfile(hparams_file):
+        if not self._fs.isfile(hparams_file):
             save_hparams_to_yaml(hparams_file, self.hparams)
 
     @rank_zero_only