[Bugfix][Server] Use Project selection color in GetPrint 3.4

Author: rldhont

src/server/services/wms/qgswmsrenderer.cpp

@@ -456,6 +456,7 @@ namespace QgsWms
 
   bool QgsRenderer::configurePrintLayout( QgsPrintLayout *c, const QgsMapSettings &mapSettings )
   {
+    c->renderContext().setSelectionColor( mapSettings.selectionColor() );
     // Maps are configured first
     QList<QgsLayoutItemMap *> maps;
     c->layoutItems<QgsLayoutItemMap>( maps );