fix: Fix Refreshing Sidebar Configuration Settings - MEED-7892 - Meed…

…s-io/MIPs#159 (#4216)

Prior to this change, the settings was lightweighted in Service JS file
before sent to server, making the changes on the original Vue object.
This change ensures to make the lightweight operation in a cloned object
instead of the original one.

webapp/src/main/webapp/vue-apps/general-settings/js/NavigationConfigurationService.js

@@ -32,6 +32,7 @@ export function getConfiguration() {
 }
 
 export function saveConfiguration(configuration) {
+  configuration = JSON.parse(JSON.stringify(configuration));
   configuration.sidebar.items.forEach(item => delete item.items);
   return fetch('/social/rest/navigation/settings', {
     headers: {