auto-hide lightgallery bars

page.html

                     thumbnail:true,
                     animateThumb: true,
                     showThumbByDefault: false,
-                    galleryId: i
+                    galleryId: i,
+                    hideBarsDelay: 2500
                 };
                 var d = lg.item(i);
                 if ($(d).find(".border").length > 0) {