thegamesdb: Fix setting multiple genres
thegamesdb: Fix setting multiple genres

The _game.Genres_ table always contains a single _genre_ value. In
case the Game contains multiple genres, we should iterate over the
array in _game.Genres.genre_ which this patch does.

Merge-request: !5
https://bugzilla.gnome.org/show_bug.cgi?id=796231

Signed-off-by: Victor Toso <39b7599ff73bbf5db531748ba5250f21fa7120ff@redhat.com>

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