BFI Player support needs updating

[wrapper]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.09.06
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[bfi:player] playlist None: Collected 0 video ids (downloading 0 of them)

Description

The patch here for bfi player support is no longer correct https://github.com/ytdl-org/youtube-dl/blob/9f182c23ba74f76ff716940b2a0568f428d6c2b9/youtube_dl/extractor/bfi.py

Free videos can still be pulled by copying the master.m3u8 file from the Network tab and pasting directly into youtube-dl. However paid video support doesn't work as the website appears to use segment.m4f files and not a master playlist

[dinosore]

<david@novo:$ youtube-dl -v https://player.bfi.org.uk/free/film/watch-listen-to-britain-1942-online
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://player.bfi.org.uk/free/film/watch-listen-to-britain-1942-online']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.09.20
[debug] Python version 2.7.18 (CPython) - Linux-5.4.0-48-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: none
[debug] Proxy map: {}
[bfi:player] listen-to-britain-1942: Downloading webpage
[download] Downloading playlist: None
[bfi:player] playlist None: Collected 0 video ids (downloading 0 of them)
[download] Finished downloading playlist: None
david@novo:$ >