fix passes test (#1391)
fix passes test (#1391)

The new testdata introduced a failing test in
`PassesTest.RoundtripMultiGroupPasses`
which we fix here.
libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl