remove variable data_visualization_version and did some formatting

[erikg16]

Pull Request

Description

Removed variables no more needed. Confirmed the variables where not in use. Did some formatting of the variables to follow best practice.

Fixes #

How Has This Been Tested?

no test possible because no part of "openclimatefix"

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[peterdudfield]

Thanks @erikg16 for this, I'm gona merge it to a developmetn and then I can deplou

[peterdudfield]

@all-contributors please add @erikg16 for code

[allcontributors[bot]]

@peterdudfield

I've put up a pull request to add @erikg16! :tada: