Refresh ondeck when marked play is pressed
Marking a video which is 'On Deck' as 'unplayed' does not seem to immediately remove it from the 'On Deck' bar. In addition 'On Deck' is currently incorrectly displayed as 'Ondeck'.
https://www.reddit.com/r/linux/comments/dzh42b/girens_a_gtk_plex_media_player_client_just/f8prg2b/