Remove linter ignores

[yorickdowne]

Changes

No longer ignore flake8 E252 and W504

Types of changes

What types of changes does your code introduce?

• [ ] Bugfix (a non-breaking change that fixes an issue)
• [ ] New feature (a non-breaking change that adds functionality)
• [ ] Breaking change (a change that causes existing functionality not to work as expected)
• [ ] Optimization
• [ ] Refactoring
• [ ] Documentation update
• [ ] Build-related changes
• [x] Other: Lint rules