Masterbar: the background color for Default scheme is wrong

[fushar]

Quick summary

When we're on wp-admin (not Calypso) screens, the background color of the masterbar for the Default scheme is wrong.

Steps to reproduce

1. Prepare a site.
2. Go to Users -> Profile.
3. Set the color scheme to Default.
4. Go to Dashboard (or any wp-admin screen)
5. Observe the background color of the masterbar.

What you expected to happen

The color is correct (#c3c4c7)

What actually happened

The color is wrong (#101517)

Impact

Most (> 50%)

Available workarounds?

No but the platform is still usable

If the above answer is "Yes...", outline the workaround.

No response

Platform (Simple and/or Atomic)

Simple, Atomic

Logs or notes

I am almost certain that this is a regression from https://github.com/Automattic/jetpack/pull/39371.

[jartes]

📌 REPRODUCTION RESULTS

• Tested on Simple – Replicated
• Tested on Atomic – Replicated

📌 FINDINGS/SCREENSHOTS/VIDEO

📌 ACTIONS

• Triaged
• Lowering priority from High to Low, as the color difference is minor.