ARROW-16526: [Python] test_partitioned_dataset fails when building with PARQUET but without DATASET
ARROW-16526: [Python] test_partitioned_dataset fails when building with PARQUET but without DATASET

One of the legacy parquet dataset tests was not properly passing use_legacy_dataset and this caused the test to attempt to use the new datasets module even if it wasn't enabled

Closes #13116 from westonpace/bugfix/MINOR--missing-dataset-mark

Authored-by: Weston Pace <0dd0706858a011bb30a3fd82b71cee4f9094c502@gmail.com>
Signed-off-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>

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