README.md no longer fluid, no matter the setting

Summary

If the user sets it's layout preferences to fluid the README preview should expand over the whole area, like it did before 13.0

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Example Project

https://gitlab.com/max-wittig/readme-not-fluid

What is the current bug behavior?

Fluid layout is not applied to preview README, when the layout width is set to fluid

What is the expected correct behavior?

Like in GitLab < 13, the README should expand to the corners, when

Edited by Max Wittig