Admin color scheme should apply to frontend admin bar

[curtiskessler]

When an admin color scheme is chosen other than default, the color scheme applies to the backend admin bar but not the frontend admin bar.

From a user perspective, this is jarring and unexpected, because the frontend admin bar "feels" like it is the same admin bar as the backend admin bar.

The frontend admin bar should share the chosen color scheme of the backend admin bar, unless technical reasons prevent this.

[dlh]

Hey @curtiskessler,

As noted in ticket:51674#comment:1, this behavior has been discussed a few times previously. Have a look at the tickets linked in that comment for the reasoning behind the behavior, particularly #26021.