[Twitter] Add support to x.com urls

[Delphox]

Since a couple weeks ago, the iOS app for Twitter/X has been using x.com for shared/copied urls, and therefore they've been popping up in sites like Discord as they embed just like twitter urls (although they still redirect to twitter when opened in the browser).

I tried adding x.com as a custom site inside twitter extractor as a temporary workaround as shown in #1658 but it didn't work.

[mikf]

I tried adding x.com as a custom site inside twitter extractor as a temporary workaround as shown in #1658 but it didn't work.

That only works for certain sites. Basically anything that is not in the main list of docs/supportedsites.