Fix extension subclass initialization
Fix extension subclass initialization

Distrotech/libpeas,Distrotech/libpeas,gregier/libpeas,chergert/libpeas,GNOME/libpeas,chergert/libpeas,gregier/libpeas,gregier/libpeas,GNOME/libpeas,gregier/libpeas,chergert/libpeas,Distrotech/libpeas