Fix false FALoginCookieError

[mruac]

The ensure_login! method was always returning the FALoginCookieError due to the @user_cookie returning true, so I just made it false so it won't return the error.

[Deer-Spangle]

Gosh, these rubocop warnings are way noisier than I would like

[Deer-Spangle]

The user cookie is set on line 290 of that file, in the before block that runs before every request. It reads the HTTP_FA_COOKIE for each request, so it'll be truthy if that header is provided, and false otherwise.
Hence why this ensure_login method checks if it is truthy, and raises an exception if not. It's the protection against use of those endpoints without the user specifies their own cookies, rather than using the server default ones