Fix deprecated gsd modes.

[joaander]

Description

Change gsd modes to non-deprecated ones. With these changes, hoomd-examples is ready for the upcoming GSD 3.0 release.

Checklist:

• [x] I have reviewed the Contributor Guidelines.
• [x] I agree with the terms of the HOOMD-blue Contributor Agreement.
• [x] My name is on the list of authors.

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