For kernel selection we already choose a default like this, which makes
sense since there's no point in having a preselected choice which
doesn't exist (anymore). Also useful for some test suites where it runs
"yes | pmbootstrap init" which would hang on this question.
Reviewed-by: Oliver Smith <ollieparanoid@postmarketos.org>
Link: https://lists.sr.ht/~postmarketos/pmbootstrap-devel/%3C20230607204449.84020-2-luca@z3ntu.xyz%3E