Hotfix for radiko.jp

[road-master]

Description of your pull request and other information

Summary of issue:

Can't download radiko.jp Time Free.
See also: #6090

Cause

The update of radiko.jp.
Some of supplied hosts are not supported by FFmpeg.
Note that the version of FFmpeg is not related with this issue.

Summary of update

Filter supplied hosts before check details of them.

• Condition is little complex.
  • To simplify, stop to use is_onair and implement method like is_unsupported_host() into class: RadikoIE and RadikoRadioIE instead and move condition into its method.
    • However, this pull request leave it since this is hotfix.

Confirmed tests

• Download radiko.jp Live
• Download radiko.jp Time Free
• Play downloaded AAC file
• Check format of donwloaded AAC file by MediaInfo
• Check which supplied host is available or not

Investigation result

• Live has dedicated host
• The host: radiko.jp is the firstest host to download
  • However, some of programs doesn't support this host, it requires one more scheme to prioritize radiko.jp
    • So that this pull request doesn't do anything for this.
• The difference between downloaded AAC files from each host is only stream size.
• When FFmpeg connect to c-radiko.smartstream.ne.jp, FFmpeg forcibly connects not Time Free but Live.

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests
  (Maybe, automated test for radiko.jp doesn't exist.)

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

[pukkandan]

I believe this can be simplified to:

Suggested change

	if is_onair and not pcu.startswith(self._HOSTS_FOR_LIVE) or (not is_onair and (pcu.startswith(self._HOSTS_FOR_TIME_FREE_FFMPEG_UNSUPPORTED) or pcu.startswith(self._HOSTS_FOR_LIVE)))):
	if (on_air ^ pcu.startswith(self._HOSTS_FOR_LIVE)) or (
	not is_onair and pcu.startswith(self._HOSTS_FOR_TIME_FREE_FFMPEG_UNSUPPORTED)):