who_pumpkin misnomer

[ap]

Arguably this action should have been called who_pumpking (note the “g”) at the end (see “pumpkin” vs “pumpking” in perlglossary).

It is probably not a worthwhile use of time to fix the URL now, and we should just retcon “who_pumpkin” as meaning “who has held the pumpkin“, but the nav menu item and page heading should still say “List of pumpkings” and the list “Registered pumpkings”.