Fix incorrect import in tests resulting from Mezzanine's new settings app.
Fix incorrect import in tests resulting from Mezzanine's new settings app.

dsanders11/cartridge,Kniyl/cartridge,Parisson/cartridge,viaregio/cartridge,syaiful6/cartridge,dsanders11/cartridge,Kniyl/cartridge,syaiful6/cartridge,traxxas/cartridge,syaiful6/cartridge,viaregio/cartridge,jaywink/cartridge-reservable,wyzex/cartridge,wbtuomela/cartridge,ryneeverett/cartridge,stephenmcd/cartridge,stephenmcd/cartridge,ryneeverett/cartridge,wbtuomela/cartridge,ryneeverett/cartridge,jaywink/cartridge-reservable,Parisson/cartridge,Parisson/cartridge,dsanders11/cartridge,stephenmcd/cartridge,jaywink/cartridge-reservable,wyzex/cartridge,traxxas/cartridge,traxxas/cartridge,wbtuomela/cartridge,Kniyl/cartridge,wyzex/cartridge