Seiga: fix getting artist name
Seiga: support alternate type of direct link url
Don't instantly make a request to get info when using bookmarklet

Currently this is done twice: once when the page first loads (although
this one isn't used) and then a second time asynchronously with
javascript (which is used). This commit removes the first one, improving
upload page load time.
Seiga: fix getting tags
Seiga: fix source uploads not working
Seiga: fix source uploads still not working in some cases
Update seiga and pixiv source tests, and seiga vcr cassettes

fixes #2142