Fix: Update Accent 1 color for Midnight variation.

[juanfra]

Description

Fixes #448

Update the Accent 1 color for Midnight variation to #5644BC

Screenshots

Screen.Recording.2024-10-08.at.18.35.04.mov

Testing Instructions

1. On the site editor, choose the "Midnight" variation.
2. Create a page.
3. Create a group with the "Style 3" style.
4. Confirm the background is now #5644BC

[github-actions]

Preview changes

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• Preview changes for twentytwentyfive

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[carolinan]

Looks nice and passes the color contrast requirements 👍

[github-actions]

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Co-authored-by: juanfra <[email protected]>
Co-authored-by: carolinan <[email protected]>
Co-authored-by: beafialho <[email protected]>

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