message: Use auto split argument in test
diff: @@ -1446,8 +1446,7 @@ fn do_not_package_if_src_was_modified() {
  );
  assert_that(
  - p.cargo("package")
  - .arg("--no-verify"),
  + p.cargo("package --no-verify"),
  execs().with_status(0),
  );
  }
  