[apple-trailers] Notify remaining==0 when user cancels operation
[apple-trailers] Notify remaining==0 when user cancels operation

When user cancels browse() operation, invoke the callback for last time, with
remaining as 0, so UI knows that cancel was in fact done.

MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,MathieuDuponchelle/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,jasuarez/grilo-plugins,MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,kyoushuu/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,kyoushuu/grilo-plugins,vrutkovs/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,kyoushuu/grilo-plugins,GNOME/grilo-plugins,jasuarez/grilo-plugins