Update matrix_servers for maubot fix

Fix labels management hostname to prevent overriding vars.yml

group_vars/matrix_servers

@@ -2925,7 +2925,7 @@ matrix_bot_maubot_container_labels_traefik_docker_network: "{{ matrix_playbook_r
 matrix_bot_maubot_container_labels_traefik_entrypoints: "{{ traefik_entrypoint_primary }}"
 matrix_bot_maubot_container_labels_traefik_tls_certResolver: "{{ traefik_certResolver_primary }}"
 
-matrix_bot_maubot_container_labels_management_hostname: "{{ matrix_server_fqn_matrix }}"
+matrix_bot_maubot_container_labels_management_hostname: "{{ matrix_bot_maubot_hostname }}"
 
 # Postgres is the default, except if not using internal Postgres server
 matrix_bot_maubot_database_engine: "{{ 'postgres' if postgres_enabled else 'sqlite' }}"