Remove unnecessary call to user_event_show_next()

This code path was only hit when query_user_events() returned false,
and user_vent_show_next() returns early and does nothing when this is
false.

src/start_end.c

@@ -575,7 +575,6 @@ start_week_round(void)
 	(week_round > 1 && 
 	 !query_user_games_in_week_round(week, week_round - 1)))) 
     {
-	user_event_show_next();
 	end_week_round();
     }
     else