should fix click on close works when sticky

IPython/frontend/html/notebook/static/js/tooltip.js

@@ -77,7 +77,7 b' var IPython = (function (IPython) {'
             closespan.addClass('ui-icon-close');
         closelink.append(closespan);
         closelink.click(function(){
-        that.hide();
+        that.remove_and_cancel_tooltip(true);
             });
         
         //construct the tooltip