The variable |type| doesn't exist here; what we want to do is using the
first member of the contentTypes array instead.
Probably a leftover of some refactoring of the code I did while working
on this.
This patch fixes starting of the default application for a given content
type if the control-center panel is set to run it when a device is
plugged.
https://bugzilla.gnome.org/show_bug.cgi?id=660821