plparse: Add missing direction annotations to TotemPlPlaylist
plparse: Add missing direction annotations to TotemPlPlaylist

https://bugzilla.gnome.org/show_bug.cgi?id=707642

MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser