Inform iconLayers when we change current tilelayer

When an editor change the background layer from our own selector,
we need to inform iconLayers, so it can update its list and order
accordingly

umap/static/umap/js/umap.controls.js

@@ -1208,7 +1208,9 @@ L.U.TileLayerControl = L.Control.IconLayers.extend({
     }
     const maxShown = 10
     L.Control.IconLayers.prototype.setLayers.call(this, layers.slice(0, maxShown))
+    if (this.map.selected_tilelayer) this.setActiveLayer(this.map.selected_tilelayer)
   },
+
 })
 
 /* Used in edit mode to define the default tilelayer */