Fix mousewheel can not have a preventDefault

Chrome complains about it: "Unable to preventDefault inside passive event listener due to target being treated as passive."

Signed-off-by: William Desportes <williamdes@wdes.fr>

js/src/table/gis_visualization.js

@@ -238,7 +238,6 @@ AJAX.registerOnload('table/gis_visualization.js', function () {
     });
 
     $(document).on('mousewheel', '#placeholder', function (event, delta) {
-        event.preventDefault();
         var relCoords = getRelativeCoords(event);
         if (delta > 0) {
             // zoom in