[FIX] web_editor: disable command hints on navigation items

Before this commit a "List" command hint was set as placeholder in
navigation items without content upon selection of the header menu. This
showed up when using the sidebar template of the header menu.

After this commit the command hints are blacklisted for nav-items in
website.

task-2677310

closes odoo#78937

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -116,8 +116,12 @@ const Wysiwyg = Widget.extend({
                 }
             },
             isHintBlacklisted: node => {
-                return node.hasAttribute &&
-                    (node.hasAttribute('data-target') || node.hasAttribute('data-oe-model'));
+                return (node.classList && node.classList.contains('nav-item')) || (
+                    node.hasAttribute && (
+                        node.hasAttribute('data-target') ||
+                        node.hasAttribute('data-oe-model')
+                    )
+                );
             },
             filterMutationRecords: (records) => {
                 return records.filter((record) => {