Initialize theme colors from custom branding

[farmakiG]

Summary
Initialize the marketplace branding colors in the Profile "color scheme" section.

Details
In case a custom branding has been defined for a marketplace and no display settings are already saved for a specific user, then initialize the default branding colors, such as primary, navbar bg color, etc. in the color scheme section of the "Profile" page. Right now these colors are black. See below screenshot.

Acceptance criteria

• UI Customizeability is preserved
• Manual tests
• UI Screenshots
• UI Webtest to check color values initialization

Screenshots

Additional context
N/A.