Whoops, fix changing of heads - broken by typo.
Whoops, fix changing of heads - broken by typo.

fbaumgardt/arethusa,alpheios-project/arethusa,fbaumgardt/arethusa,latin-language-toolkit/arethusa,PonteIneptique/arethusa,latin-language-toolkit/arethusa,Masoumeh/arethusa,alpheios-project/arethusa,PonteIneptique/arethusa,alpheios-project/arethusa,Masoumeh/arethusa,fbaumgardt/arethusa