Fix "Layer not found: route-quality" error msg (ignore built-in layers)

js/LayersConfig.js

@@ -2,6 +2,8 @@ BR.LayersConfig = L.Class.extend({
     defaultBaseLayers: BR.confLayers.defaultBaseLayers,
     defaultOverlays: BR.confLayers.defaultOverlays,
     legacyNameToIdMap: BR.confLayers.legacyNameToIdMap,
+    // hardcoded, built-in layers with an id set (for URL hash)
+    builtInLayers: ['route-quality'],
 
     initialize: function(map) {
         this._map = map;

js/control/LayersTab.js

@@ -270,7 +270,9 @@ BR.LayersTab = BR.ControlLayers.extend({
             var obj = this._layers[i];
             // id set in LayersConfig.createLayer
             var id = obj.layer.id;
-            if (id) {
+
+            // ignore built-in layers
+            if (id && this.layersConfig.builtInLayers.indexOf(id) === -1) {
                 if (obj.overlay) {
                     overlays.push(id);
                 } else {