[vvvvid] fix season title extraction (#27601)

[nixxo]

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fixes #27601

the only place where to find the season "title" is to call the same url used in the playlist extractor and scroll the file looking for the season that the current video beloongs end save the season "title" that way.

It's probably not super efficient or elegant

Or I can extract it in the playlist extractor and use url_transparent to pass it, it's a lot easier and cleaner:

'_type': 'url_transparent',
'ie_key': VVVVIDIE.ie_key(),
...
'season': str_or_none(season.get('name'))

but if you download the single episode you don't have the 'season title' info available.