Update ARVR{Anchor,Controller}'s configuration warning

Updates their config warning upon change of `controller_id`
or `anchor_id`, respectively.

fixes godotengine/godot#23881

scene/3d/arvr_nodes.cpp

@@ -266,6 +266,7 @@ void ARVRController::set_controller_id(int p_controller_id) {
 	// We don't check any bounds here, this controller may not yet be active and just be a place holder until it is.
 	// Note that setting this to 0 means this node is not bound to a controller yet.
 	controller_id = p_controller_id;
+	update_configuration_warning();
 };
 
 int ARVRController::get_controller_id(void) const {
@@ -446,6 +447,7 @@ void ARVRAnchor::set_anchor_id(int p_anchor_id) {
 	// We don't check any bounds here, this anchor may not yet be active and just be a place holder until it is.
 	// Note that setting this to 0 means this node is not bound to an anchor yet.
 	anchor_id = p_anchor_id;
+	update_configuration_warning();
 };
 
 int ARVRAnchor::get_anchor_id(void) const {