Make the Play Next countdown timer user adjustable

[tom80H]

This should actually now be available on a number of platforms.

See „ Auto Play Countdown Time (Plex Pass Required)“:

Player Experience

We have added a bunch of Player experience features available to Plex Pass subscribers. The account using the playback device must have a Plex Pass or be in a Plex Home where the home admin has a Plex Pass. Some of the setting options marked as “default” were the existing behaviours and what accounts without a Plex Pass will experience if they have access to the feature at all (non-Plex Pass account do not have access to Skip Intro for example so that default will not affect them ) Current P…