fix: switch back to parent

Hello,

"switch back to parent" command should ignore ancestry. If the user
switched something to a directory ignoring ancestry, he can't switch
back to the parent now, because in this case ignore_ancestry should be
true. Per definitionem switching back to the parent is always
"returning to the correct ancestry", so the ignore_ancestry should be
turned on in this case, and it can't cause problems.

Cheers,
Abel

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