We were using the xdg directories to check whether we can star a file
or not, since the star feature only works on directories that are
tracked by tracker.

Tracker is usually shipped in distributions tracking the
xdg-directories, so we check that as a stop gap solution for 3.30
since we didn't have time to actually query what directories tracker
is tracking and match that.

This work makes it so that we show the star action on tracked
directories.