project panel: Update decoration icon active color (#20723)

Just so that the icon decoration knockout color matches the background
of a selected/market item.

<img width="600" alt="Screenshot 2024-11-15 at 10 50 24"
src="https://github.com/user-attachments/assets/0037fe5a-f42d-47e8-8559-97ca11ff2d97">

Release Notes:

- N/A