tracker: Correct errors returned
tracker: Correct errors returned

Some errors were incorrectly returned as BROWSE_FAILED.

https://bugzilla.gnome.org/show_bug.cgi?id=794691

grilofw/grilo-plugins,GNOME/grilo-plugins,jasuarez/grilo-plugins,GNOME/grilo-plugins,jasuarez/grilo-plugins,grilofw/grilo-plugins