fix(history): fix logic error in prompt for `history -c` (#12500)

Logic error in `history -c` when prompting for confirmation caused history
to be deleted when typing anything but explicitly `n`, `N`, or sending `\n`.
New logic prevents deletion by pressing wrong key and only deletes
history when sending `y` or `Y`.

Co-authored-by: Sargates <nicholas.g.glenn@gmail.com>