OpenTopoMap max zoom on fallback server only z15, fixes #21;

also fix max zoom for other services to actual

js/index.js

@@ -20,13 +20,13 @@
         });
 
         var osmde = L.tileLayer('http://{s}.tile.openstreetmap.de/tiles/osmde/{z}/{x}/{y}.png', {
-            maxZoom: 19,
+            maxZoom: 18,
             attribution: 'tiles by <a target="_blank" href="http://openstreetmap.de/karte.html">openstreetmap.de</a> ' + osmAttribution
         });
 
         var topo = L.tileLayer('http://{s}.tile.opentopomap.org/{z}/{x}/{y}.png', {
             minZoom: 5,
-            maxZoom: 16,
+            maxZoom: 15,
             attribution: 'tiles &copy; <a target="_blank" href="https://opentopomap.org">OpenTopoMap</a>, <a target="_blank" href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>'
                 + ', <a target="_blank" href="http://viewfinderpanoramas.org">SRTM</a>'
         });
@@ -43,13 +43,13 @@
         });
 
         var cycling = L.tileLayer('http://tile.waymarkedtrails.org/cycling/{z}/{x}/{y}.png', {
-          maxZoom: 19,
+          maxZoom: 18,
           opacity: 0.7,
           attribution: 'Cycling &copy; <a target="_blank" href="http://cycling.waymarkedtrails.org">Waymarked Trails</a> '
                   + '(<a target="_blank" href="http://creativecommons.org/licenses/by-sa/3.0/de/deed.en">CC-BY-SA 3.0 DE</a>)'
         });
         var hiking = L.tileLayer('http://tile.waymarkedtrails.org/hiking/{z}/{x}/{y}.png', {
-          maxZoom: 19,
+          maxZoom: 18,
           opacity: 0.7,
           attribution: 'Hiking &copy; <a target="_blank" href="http://hiking.waymarkedtrails.org">Waymarked Trails</a> '
                   + '(<a target="_blank" href="http://creativecommons.org/licenses/by-sa/3.0/de/deed.en">CC-BY-SA 3.0 DE</a>)'