[FIX] website blog: open change cover wizard at second selection

Fixes #2470

addons/website_blog/static/src/js/website_blog.editor.js

@@ -49,7 +49,7 @@ $(document).ready(function() {
                 $(document.body).on('media-saved', self, function (o) {
                     var url = $('.cover-storage').attr('src');
                     $('.js_fullheight').css({"background-image": !_.isUndefined(url) ? 'url(' + url + ')' : "", 'min-height': vHeight});
-                    $('.cover-storage').remove();
+                    $('.cover-storage').hide();
                 });
                 editor.appendTo('body');
             },