[Bug] "Play next by default" ("continue") option is not being respected on playlists

[douglascaetano]

Describe the bug
The option "Play next by default" (continue option in the PREFS cookie) is not being respected when playing videos from a playlist.

Steps to Reproduce

1. Go to Preferences and turn off "Play next by default" and any other autoplay options;
2. Go to a playlist (e.g. <invidious instance>/playlist?list=PLTCEzde-ifJUZ-vsBkMFJVZwevy4nuRnQ);
3. Play a video;
4. When the video ends, the next one in the playlist is loaded automatically.

Additional context
I'm running on macOS and using Safari.

After inspecting the code, it seems the problem lays here:

invidious/assets/js/watch.js

Line 79 in 08390ac

player.on('ended', function () {

This sets an event for when the video ends, whose action is to redirect to the next video unconditionally.

[SamantazFox]

Likely related: #693