[IMP] web_editor: update Jabberwock library to commit 4b2c903b

Changelog:
[FIX] DomLayout: Make sure falsy attribute values are not transformed into null

closes odoo/odoo#61875

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

addons/web_editor/static/lib/jabberwock/jabberwock.js

@@ -14624,7 +14624,7 @@ odoo.define('web_editor.jabberwock', (function(require) {
                 const newAttributes = domObject.attributes || {};
                 const oldAttributes = (old === null || old === void 0 ? void 0 : old.object.attributes) || {};
                 for (const name in oldAttributes) {
-                    if (!newAttributes[name]) {
+                    if (typeof newAttributes[name] === 'undefined') {
                         hasChanged = true;
                         if (name === 'style') {
                             for (const key in oldAttributes[name]) {