Update plot_oedi_9068.py

[ChemPhys-lund]

removed extra comas ',' in the code

• [ ] Closes #xxxx
• [x] I am familiar with the contributing guidelines
• [ ] Tests added
• [ ] Updates entries in docs/sphinx/source/reference for API changes.
• [ ] Adds description and name entries in the appropriate "what's new" file in docs/sphinx/source/whatsnew for all changes. Includes link to the GitHub Issue with :issue:`num` or this Pull Request with :pull:`num`. Includes contributor name and/or GitHub username (link with :ghuser:`user`).
• [ ] New code is fully documented. Includes numpydoc compliant docstrings, examples, and comments where necessary.
• [x] Pull request is nearly complete and ready for detailed review.
• [ ] Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.

[AdamRJensen]

@ChemPhys-lund Generally we like having trailing commas when there are multiple lines of input parameters. The reason is that if you add an additional parameter, then the prior line doesn't show up in the Git diff.