don't preload videos, try to fix Leaflet CSP errors

layouts/locations/list.html

@@ -25,7 +25,7 @@
             fullscreenControl: true
         }).setView([55, -3], 3);
 
-        L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
+        L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
             maxZoom: 19,
             attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>'
         }).addTo(map);