Reactivation of one of the GPU tests.

[drivanov]

Description

The test_batch-heterograph.py::test_batch_netypes has no problems anymore and is ready to be reactivated. I tried running this test on 5 different machines with different GPU cards.

Checklist

Please feel free to remove inapplicable items for your PR.

• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• [ ]

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