Deregister simpleToMultiSelect properly
Deregister simpleToMultiSelect properly

Fixes #635

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