cmd/strelaypoolsrv: Update map tile URL (#8985)

cmd/strelaypoolsrv/gui/index.html

@@ -237,7 +237,7 @@
       uptimeSeconds: 0,
     };
     $scope.map = L.map('map').setView([40.90296, 1.90925], 2);
-    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+    L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png',
     {
       attribution: 'Leaflet',
       maxZoom: 17