update: remove setting

sib-chat.js

@@ -207,7 +207,6 @@ export const SibChat = {
       'show_desktop_notifications': false,
       // 'use_system_emojis': false,
       // 'show_send_button': true,
-      'singleton': true,
       'sounds_path': 'https://cdn.happy-dev.fr/conversejs/sounds/',
       'view_mode': 'fullscreen',
       'visible_toolbar_buttons': {