Unscrobbling no longer seems to work

[thk123]

I fixed a few issues (err -> error type thing) and crucially, changing the user name that is hard coded in unscrobble.js which I assume needs to be set to my user.

However, even when fixing that I get a 404. I believe this is because the URL for deleting a scrobble is now https://www.last.fm/user/username/library/delete (found by inspecting the source of the delete option from last.fm).

However, even after fixing that I simply get a response:

{"result": false}

I tried at that point logging out and resetting and now can't even log in so perhaps something weird going on on my end - will do some further investigation and aim to raise a PR for fixing those mentioned issues.