free GDate leaks when inserting them into the model
free GDate leaks when inserting them into the model

The model copies the date so we should free it afterward.

https://bugzilla.gnome.org/show_bug.cgi?id=663873

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets