no max zoom

public/ar_overviewmap.js

@@ -57,7 +57,7 @@ function init_map() {
             var OpenStreetMap_DE = L.tileLayer(
                 'https://tile.openstreetmap.de/{z}/{x}/{y}.png',
                 {
-                    maxZoom: 20,
+                    //maxZoom: 20,
                     attribution:
                         '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
                 }