Fix #1411 by adding lookup for new possible user_id format

[dkhex]

For some reason request to https://pixiv.net may return page, where user id appear in a "new" format, e.g.

var dataLayer = [{ login: 'yes', gender: '0', user_id: 'USERID', lang: 'en', illustup_flg: 'not_uploaded', premium: 'no', default_service_is_touch: 'no' }]```

Added regexp search for this format into PixivBrowser.getMyId

[Litoba]

Can I download the file with this fix applied?