Add the user image to the user menu when available

Postponing pending investiagtion on [#].441118

In comment #2 it looks like this issue is postponed on itself, is that correct?

I would expect to see the user image in the expanded panel, at the top (above or below the user name), inside or near the div toolbar-popover__header.

As for the main navigation, I consider that consistency is better. So in short, for the main navigation menu footer, I prefer the statu quo; using the current icon/text.

Personally like having the consistent/minimalist icons/look here, but it's not up to me.