Support /user/status/:status_id redirects used by Twitter embeds

[jahed]

Nitter currently shows "503 Service Temporarily Unavailable" for URLs in the format:

/user/status/:status_id

Where user is the literal string "user" rather than a username. I've seen this format used in some Twitter embed widgets to link to a tweet when Twitter is blocked, likely so that they aren't affected by username changes.

https://github.com/s9e/s9e.github.io/blob/master/iframe/2/twitter.html

Twitter automatically redirects to the author of the status:

/:username/status/:status_id

It's not clear if this is known behaviour since the #919 rewrite and I haven't found an existing issue covering this.

[zedeus]

It was blocked by nitter.net some time ago due to a massive botnet scraping Nitter with thousands of IPs, and the only thing in common was "/user/status/...". They've stopped long ago so I'll remove the block.

[jahed]

Links are working now. Thanks, Zed!