Broken cancel after permission check

[xi]

Steps to reproduce

1. log out
2. click on "add proposal" (or any other link that requires login). You are then redirected to login automatically
3. click on "cancel"

Expected result

you go back to the place you started at

actual result

you are stuck on the login page.

[xi]

Related to #1061

[xi]

Note that not calling setCameFrom() before the redirect is not an option because we need that on successful login.