[extractor/medaltv] Fix medal.tv clips URL (#6489)

[xenova]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

Medal no longer uses a second API request to get the clip data. Instead, it hydrates the page with the video's data. (Fixes #6489)

NOTE: I have 2 TODOs in my code. I can't quite remember what the yt-dlp way is to get the first item in a dictionary, without knowing it's key:
e.g.,

"clips":{
    "XEXRelR8Soa7l":{
        ... // <- Actual data here
    }
},

Template

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[pukkandan]

traverse_obj(clips, ..., get_all=False)
(The ... is literal)

[xenova]

traverse_obj(clips, ..., get_all=False)

Thanks!

[xenova]

Should be good now 👍

[xenova]

That works 👍