fix header logo being always minerva for non carousel pages

web/src/ui/header.ts

@@ -1,12 +1,9 @@
 import {Selection} from "d3";
-import MinervaLogo from "../../assets/images/minervamessenger-banner-kussmund+bulb.png";
 import {ServiceTheme, Visualisation} from "../theme/model";
 import {environmentVariables} from "../configuration/environment";
-import {Canvas} from "./canvas/canvas";
 import {Subject} from "rxjs";
 import {HatnoteVisService} from "../service_event/model";
 import {VisualisationDirector} from "../theme/visualisationDirector";
-import {LegendItemHtml} from "./legend_item";
 import {Legend} from "./legend";
 
 export class Header{
@@ -34,7 +31,7 @@ export class Header{
             .style('align-items', 'center')
 
         this.logo = this.root.append("img")
-            .attr('src', MinervaLogo)
+            .attr('src', visDirector.current_service_theme.header_logo)
             .style('width', '44px')
             .style('height', 'fit-content')
             .style('margin-left', '20px')