fix checking scalar datasets

tests/test_reference_runs/test_pre_deployment.py

@@ -65,7 +65,7 @@ def compare_datasets(
     h5_diff = []
     for d in datasets:
         try:
-            if not np.allclose(file1[d][:], file2[d][:], equal_nan=True):
+            if not np.allclose(file1[d][()], file2[d][()], equal_nan=True):
                 h5_diff.append(d)
         except ValueError as e:
             LOGGER.error(f"ValueError: {e}, {d}")