Fix invalid coords assignment

.gitignore

@@ -9,3 +9,4 @@ vendor/
 docs/
 progetto_QGIS/
 conf.json
+shapefile

js/gis.js

@@ -117,7 +117,7 @@ GIS.initMap = async function (mapId, zoomLevel = this.INIT_ZOOM) {
 
     for (let id in MARKER_NAMES.sites) {
         let layer = sitesGroup.customGetLayer(id);
-        const coords = layer.getBounds().getCenter();
+        let coords = layer.getBounds().getCenter();
         const fromStorage = localStorage.getItem(id);
         let data = {};