User similarity report broken.

[evazion]

http://danbooru.donmai.us/reports/similar_users is broken. Backtrace:

HTTP error code: 404 Not Found
app/logical/reports/user_similarity.rb:41:in `block in fetch_similar_user_ids'
app/logical/reports/user_similarity.rb:36:in `fetch_similar_user_ids'
app/presenters/user_similarity_presenter.rb:18:in `fetch'
app/presenters/user_similarity_presenter.rb:6:in `initialize'
app/controllers/reports_controller.rb:24:in `new'
app/controllers/reports_controller.rb:24:in `similar_users'

Caused by https://isshiki.donmai.us/reports/user_similarity returning a 404.

http://danbooru.donmai.us/reports/uploads is also broken by https://isshiki.donmai.us/reports/uploads 404'ing.

[r888888888]

This is probably because the autogenerated reports shared the same directory. I've moved it to user-reports for now the user similarity report is working again.