added leaflet subdomains to the environment variables, which are used now for initializing a leaflet map

views/admin/map_editor.php

@@ -94,6 +94,7 @@
 @section(pageScript)
 <script>
     var tileUrl = '<?= $_ENV['LEAFLET_TILESERVER_URL'] ?>';
+    var tileSubdomains = '<?= $_ENV['LEAFLET_TILESERVER_SUBDOMAINS'] ?>';
     var tileAttribution = '<?= $_ENV['LEAFLET_TILESERVER_ATTRIBUTION'] ?>';
     var mapId = <?= $mapId ?>;
     var mapBounds = <?= json_encode($bounds) ?>;