fix(mail(js)): avoid updating the DOM before closing editor

When destroying the CKEditor instance (closing the mail editor in HTML mode), we no longer try to update the associated textarea because we're removing it anyway.

UI/WebServerResources/js/Common/sgCkeditor.component.js

@@ -319,8 +319,9 @@
     }
 
     this.$onDestroy = function () {
+      var noUpdate = true;
       editorElement.classList.add('ng-cloak');
-      editor.destroy();
+      editor.destroy(noUpdate);
     }
 
     function onInstanceReady (event) {