Allow core config updated (#26398)

homeassistant/components/websocket_api/permissions.py

@@ -8,6 +8,7 @@ from homeassistant.const import (
     EVENT_SERVICE_REMOVED,
     EVENT_STATE_CHANGED,
     EVENT_THEMES_UPDATED,
+    EVENT_CORE_CONFIG_UPDATE,
 )
 from homeassistant.components.persistent_notification import (
     EVENT_PERSISTENT_NOTIFICATIONS_UPDATED,
@@ -22,6 +23,7 @@ from homeassistant.components.frontend import EVENT_PANELS_UPDATED
 # Except for state_changed, which is handled accordingly.
 SUBSCRIBE_WHITELIST = {
     EVENT_COMPONENT_LOADED,
+    EVENT_CORE_CONFIG_UPDATE,
     EVENT_PANELS_UPDATED,
     EVENT_PERSISTENT_NOTIFICATIONS_UPDATED,
     EVENT_SERVICE_REGISTERED,