tracker: Use new "title-from-filename" property

https://bugzilla.gnome.org/show_bug.cgi?id=706877
tmdb: Override title when set from filename

https://bugzilla.gnome.org/show_bug.cgi?id=706877
local-metadata: Override title when set from filename

And add test to that effect.

https://bugzilla.gnome.org/show_bug.cgi?id=706877