Quadrat: fix triangles

[MaggieCabrera]

Changes proposed in this Pull Request:

This PR fixes the triangles on Quadrat both on the editor and frontend. This code has always been brittle and it broke because the editor changed. I think I fixed it for some kind of attachment to the code that I initially wrote myself and because this is the intended design, but my suggestion is if it breaks again, we should remove it.

Related issue(s):

Closes #5378

[github-actions]

Preview changes

I've detected changes to the following themes in this PR: Quadrat.
You can preview these changes by following the links below:

• Preview changes for Quadrat (child of blockbase)

I will update this comment with the latest preview links as you push more changes to this PR.

Note

The preview sites are created using WordPress Playground. You can add content, edit settings, and test the themes as you would on a real site, but please note that changes are not saved between sessions.
Child themes are dependent on their parent themes. You will have to install the parent theme as well for the preview to work correctly.

[github-actions]

Theme-Check results

quadrat: No changes required ✅.

⚠️ WARNING (2)

• Found a translation function that is missing a text-domain in the file inc/customizer/wp-customize-fonts.php. Function __, with the arguments 'https://wordpress.com/support/custom-fonts/'. Line 13: __( 'https://wordpress.com/support/custom-fonts/' )
• More than one text-domain is being used in this theme. This means the theme will not be compatible with WordPress.org language packs. The domains found are quadrat, blockbase.

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