MAPG-103 change map's cursor to crosshair in map editor

public/static/css/map_editor.css

@@ -4,6 +4,10 @@
     z-index: 1;
 }
 
+.leaflet-container {
+    cursor: crosshair;
+}
+
 #panorama {
     position: absolute;
     z-index: 1;