Use method call directly instead of `public_send` with fixed argument.
The cop is declared unsafe. I think that is because it can also replace
`send` but we replace only `public_send` here.
This Spree route conflicts with the one we define:
```
get "/login", to: redirect("/#/login")
```
for whatever reason there are 7 users that managed to hit the Spree one
instead of ours when confirming their signup email. It's not clear to me
though when this `/login?validation=confirmed` is really hit. The
confirmation email link passes a token in the query params and this is
not the case.
The idea is that `GET /login` makes the login modal to show up instead
of Devise's default behaviour (through inheritance) of showing a login
form page. OFN was never prepared to handle this as this bug proofs.
