Lower Complexity of UsersController

https://codeclimate.com/github/discourse/discourse/UsersController#method-complexity
I ran the test suite and ensured that all changed lines were covered. Furthermore I ran rake autospec, and the same test failed that failed before i started: 
Finished in 3 minutes 17.27 seconds
2846 examples, 1 failure
Failed examples:
rspec ./spec/models/user_action_spec.rb:202 # UserAction when user bookmarks should create a bookmark action correctly