Use preferred tile.osm.org URL

Author: simon04

www/whodidit.js

@@ -25,10 +25,8 @@ function init() {
     map = new OpenLayers.Map('map', {displayProjection: epsg4326});
 
     map.addLayer(new OpenLayers.Layer.OSM('OpenStreetMap', [
-        'https://a.tile.openstreetmap.org/${z}/${x}/${y}.png',
-        'https://b.tile.openstreetmap.org/${z}/${x}/${y}.png',
-        'https://c.tile.openstreetmap.org/${z}/${x}/${y}.png'
-    ])); //Standard mapnik tiles
+        'https://tile.openstreetmap.org/${z}/${x}/${y}.png'
+    ]));
     map.baseLayer.attribution = '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors';
 
     permalink = new OpenLayers.Control.Permalink('permalink', null, {createParams: myCreateArgs});