fix: respect all config file provided width values

[sivel]

Describe your changes

This PR aims to address #752 where width values specified in the config file below 80 or above 120 are effectively ignored, including the special value of 0.

To do this, the default value written to the config file is set to 0 to mirror the viper default for width, and the special casing to restrict with width when not user specified has been removed. Users with a pre-existing config file will still maintain the previously set value of 80, and should still see the previous behavior.

Fixes #752

Related issue/discussion: #752

Checklist before requesting a review

• [x] I have read CONTRIBUTING.md
• [x] I have performed a self-review of my code

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