[YouTube] get_video_info with el=info has invalid parameters

[Protuhj]

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Relevant portion below is the 'el=info' bit.
If you attempt to load the URL in a browser, you can see that it returns an error message.

python -m youtube_dl -F --print-traffic Sq3-W6BYpRU
[snip]
[youtube] Sq3-W6BYpRU: Downloading video info webpage
send: u'GET /get_video_info?ps=default&el=info&video_id=Sq3-W6BYpRU&hl=en&sts=17541&disable_polymer=true&gl=US&eurl=
[/snip]

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Description of your issue, suggested solution and other information

When attempting to load YouTube formats, the 'el=info' page (which used to serve the DASH MPD URL) contains the following error text in the resulting file:

errorcode=2&reason=Invalid+parameters.&status=fail

Either the el=info page should be removed, or a valid parameter set should be determined.

[anxdpanic]

el=vevo also returns Invalid parameters.

The valid el parameters I was able to find from the player.js; 'leanback', 'embedded', 'detailpage', 'editpage', 'adunit', 'previewpage', 'profilepage'
None seem to return dashmpd anymore unless it's live, my channel, or drm content.