Ketnet site reorganisation

[timconinx]

Checklist

• [ x] I'm reporting a broken site support
• [ x] I've verified that I'm running youtube-dl version 2021.01.03
• [ x] I've checked that all provided URLs are alive and playable in a browser
• [ x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
• [ x] I've searched the bugtracker for similar issues including closed ones

Verbose log

youtube-dl --verbose https://www.ketnet.be/kijken/n/nachtwacht/3/nachtwacht-s3a9-phobetor
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.ketnet.be/kijken/n/nachtwacht/3/nachtwacht-s3a9-phobetor']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2021.01.03
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg git-2019-11-18-d831edc
[debug] Proxy map: {}
[Ketnet] nachtwacht-s3a9-phobetor: Downloading webpage
ERROR: Unable to extract player config; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp7n_m4vnl\build\youtube_dl\YoutubeDL.py", line 803, in wrapper
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp7n_m4vnl\build\youtube_dl\YoutubeDL.py", line 824, in __extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp7n_m4vnl\build\youtube_dl\extractor\common.py", line 532, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp7n_m4vnl\build\youtube_dl\extractor\ketnet.py", line 53, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp7n_m4vnl\build\youtube_dl\extractor\common.py", line 1010, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract player config; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

The belgian site ketnet.be was reorganised: where at first the urls were in format "https://www.ketnet.be/kijken/nachtwacht/lucifer", now they are in the format "https://www.ketnet.be/kijken/n/nachtwacht/3/nachtwacht-s3a4-lucifer"... it's not clear what happened to the movies themselves