self-build consistency: missing var

roles/matrix-bridge-mautrix-telegram/tasks/validate_config.yml

@@ -22,3 +22,4 @@
     - {'old': 'matrix_mautrix_telegram_container_exposed_port_number', 'new': '<superseded by matrix_mautrix_telegram_container_http_host_bind_port>'}
     - {'old': 'matrix_mautrix_telegram_container_self_build', 'new': 'matrix_mautrix_telegram_container_image_self_build'}
     - {'old': 'matrix_telegram_lottieconverter_container_self_build', 'new': 'matrix_mautrix_telegram_container_image_self_build'}
+    - {'old': 'matrix_telegram_lottieconverter_container_self_build_mask_arch', 'new': 'matrix_telegram_lottieconverter_container_image_self_build_mask_arch'}