Remove extra form-selects in a results file

[jmoppel]

Fixes 2 mistakes in the test_prepended_appended_select.html result file.
Remove extraneous form-select values in two class attributes in the
results file.
Causes the previous failing test_select_prepend to pass.

[jmoppel]

Thanks for kicking off CI! The Python 3.6 series received its last security update about six months ago and is no longer supported. Does it make sense to just run CI against Python 3.7+, especially since Python 3.6 and older are causing problems? It looks like 3.6 would still work, but would just have a couple of repeated class values.

[smithdc1]

Yes we should drop 3.6 and add 3.10.