remove call to method that does not exist in monitor (apache#5189)

The method updateDebugDropdownNotification() was removed from the javascript in the monitor in an earlier commit. It was still being called and throwing a warning. This commit removes that call.

server/monitor/src/main/resources/org/apache/accumulo/monitor/resources/js/navbar.js

@@ -151,5 +151,4 @@ function refreshSideBarNotifications() {
   const statusData = sessionStorage?.status ? JSON.parse(sessionStorage.status) : undefined;
 
   updateServerNotifications(statusData);
-  updateDebugDropdownNotification(statusData);
 }