do not create MAS DB if MAS is disabled

group_vars/matrix_servers

@@ -4027,7 +4027,7 @@ postgres_managed_databases_auto: |
       'name': matrix_authentication_service_config_database_database,
       'username': matrix_authentication_service_config_database_username,
       'password': matrix_authentication_service_config_database_password,
-    }] if (matrix_authentication_service_config_database_host == postgres_connection_hostname) else [])
+    }] if (matrix_authentication_service_enabled and matrix_authentication_service_config_database_host == postgres_connection_hostname) else [])
     +
     ([{
       'name': matrix_sliding_sync_database_name,