Fix pybullet

[mathuvu]

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context / Related issue

Fix X11 error when using pybullet in gym experiments

How Has This Been Tested (if it applies)

Checklist

• [x] The documentation is up-to-date with the changes I made.
• [x] I have read the CONTRIBUTING document and completed the CLA (see CLA).
• [x] All tests passed, and additional code has been covered with new tests.

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