Remove hardcoded predictions subfolder

src/ptbench/engine/callbacks.py

@@ -407,8 +407,7 @@ class PredictionsWriter(lightning.pytorch.callbacks.BasePredictionWriter):
         for dataloader_idx, dataloader_name in enumerate(dataloader_names):
             logfile = os.path.join(
                 self.output_dir,
-                f"predictions_{dataloader_name}",
-                "predictions.csv",
+                f"{dataloader_name}.csv",
             )
             os.makedirs(os.path.dirname(logfile), exist_ok=True)