Fix route misconfig

Author: zenoachtig

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/demo/route.ts

@@ -114,7 +114,6 @@ export async function GET(
             'What can I ask you?',
             'Show me tips and tricks',
         ],
-        tabs: ['assistant'],
     });
         window.GitBook('open');
     </script>