enable zoomControl for Leaflet map to be consistent with Google map

public/static/js/map_editor.js

@@ -377,8 +377,7 @@
                 LMapWrapper.divId = divId;
                 LMapWrapper.map = L.map(LMapWrapper.divId, {
                     center: { lat: 0., lng: 0. },
-                    zoom: 2,
-                    zoomControl: false
+                    zoom: 2
                 });
 
                 LMapWrapper.map.on('click', function (e) {