Fix expression-not-assigned
src/mailcow/__main__.py:6:0: W0106: Expression "__name__ == '__main__' and mailcow.cli.main()" is assigned to nothing (expression-not-assigned)src/mailcow/__main__.py:6:0: W0106: Expression "__name__ == '__main__' and mailcow.cli.main()" is assigned to nothing (expression-not-assigned)