Login page not visible anymore when logged-in

Ghost User
2020-02-05T21:24:02+01:00

Closes #979

#### Previous behaviour
Steps to reproduce:

1. log in
2. visit thalia.nu/user/login

#### New behaviour
Steps to validate that it works:

1. log in
2. visit thalia.nu/user/login
3. get redirected to home

Closes #979 (closed)

Previous behaviour

Steps to reproduce:

1. log in

2. visit thalia.nu/user/login

New behaviour

Steps to validate that it works:

1. log in

2. visit thalia.nu/user/login

3. get redirected to home