Make matrix-static-files not reference other `matrix_authentication_service_*` variables if MAS is not enabled

group_vars/matrix_servers

@@ -6194,7 +6194,7 @@ matrix_static_files_file_matrix_client_property_org_matrix_msc3575_proxy_url: "{
 
 matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_enabled: "{{ matrix_authentication_service_enabled }}"
 matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_issuer: "{{ matrix_authentication_service_config_http_issuer if matrix_authentication_service_enabled else '' }}"
-matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_account: "{{ matrix_authentication_service_account_management_url }}"
+matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_account: "{{ matrix_authentication_service_account_management_url if matrix_authentication_service_enabled else '' }}"
 
 matrix_static_files_file_matrix_client_property_m_tile_server_entries_enabled: "{{ matrix_client_element_location_sharing_enabled }}"
 matrix_static_files_file_matrix_client_property_m_tile_server_map_style_url: "{{ ('https://' if matrix_playbook_ssl_enabled else 'http://') + matrix_server_fqn_element }}/map_style.json"