Fix artifacts or black screen when paused
Fix artifacts or black screen when paused

Fix regression introduced by commit eb74e996.

The video widget expects to not be double-buffered by default,
and was due to an error when converting from pre-G_SEAL gtk_widget
calls.

https://bugzilla.gnome.org/show_bug.cgi?id=614177

mediaserver2-plugins/totem-mediaserver2,mediaserver2-plugins/totem-mediaserver2