[FIX] web_editor: properly start website edit mode as restricted editor

It was impossible to open the website's edit mode as a user with
"restricted editor" permissions. The reason was that wysiwyg_multizone
was trying to manipulate data that is not injected into the html node
when `editable` is false (see `website.layout` template).

closes odoo/odoo#31702

Signed-off-by: Pierre Paridans <pparidans@users.noreply.github.com>

addons/website/static/src/js/editor/wysiwyg_multizone.js

@@ -331,7 +331,7 @@ var WysiwygMultizone = Wysiwyg.extend({
         var data = this._super();
         var res_id = $editable.data('oe-id');
         var res_model = $editable.data('oe-model');
-        if (!$editable.data('oe-model')) {
+        if (!$editable.data('oe-model') && $('html').data('editable')) {
             var object = $('html').data('main-object');
             res_model = object.split('(')[0];
             res_id = +object.split('(')[1].split(',')[0];

addons/website/static/src/js/tours/restricted_editor.js

@@ -0,0 +1,17 @@
+odoo.define("website.tour.restricted_editor", function (require) {
+"use strict";
+
+var tour = require("web_tour.tour");
+
+tour.register("restricted_editor", {
+    test: true,
+    url: "/",
+}, [{
+    trigger: 'a[data-action=edit]',
+    content: "Click \"EDIT\" button of website as Restricted Editor",
+    extra_trigger: ".homepage",
+}, {
+    trigger: '#oe_snippets.o_loaded',
+    content: "Check that the snippets loaded properly",
+}]);
+});