fix(editorconfig): use off for max_line_length

[donovanglover]

Fixes "invalid value for option max_line_length: null"

See: https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties#max_line_length

Description

• [x] I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• [ ] Chore (non-breaking change which does not add functionality)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Change to the templates directory (does not affect core functionality)
• [x] Change to the examples directory (does not affect core functionality)
• [ ] This change requires a documentation update

Checklist:

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] Existing test suite passes locally with my changes
• [ ] I have made corresponding changes to the documentation

[donovanglover]

@jacobsfletch Would appreciate a review!

[denolfe]

Thanks!