Fix some error in hyperopt spark code

[WeichenXu123]

Fix some error in hyperopt spark code. Current code overwrite self._job_group_id and self._job_desc to be None due to negligence.

[WeichenXu123]

Test passed :

# install pyspark 3.2
pip install --force-reinstall https://dist.apache.org/repos/dist/dev/spark/v3.2.0-rc2-bin/pyspark-3.2.0.tar.gz
pytest hyperopt/tests/test_spark.py 

[WeichenXu123]

@maxpumperla Could you help review and merge ? Thanks!

[maxpumperla]

good catch, thanks.