Remove quotes to meet style guidelines

[casperklein]

Description

This PR remove quotes in if-statements, to meet the projects style guidelines

Fixes #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change that does improve existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md or the documentation under docs/)
• If necessary I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[georglauterbach]

The network issue seems to have lasted longer. I've restarted the tests again.

[github-actions]

Documentation preview for this PR is ready! 🎉

Built with commit: cd48abb

[georglauterbach]

@casperklein when you merge this, please remove the other label from the new version's PR :)