Solved Redirect Loop caused by 2FA login edge-case

[Steffen]

How to reproduce:

1. Enable 2FA in your XenForo account if not already done
2. Log out from XenForo
3. Open Register
4. Click on the "Log in" button in the header (this makes the login dialog appear on the register page whose URL remains the same)
5. Log in with your username + password
6. Complete the 2FA challenge

What happens next is an infinite redirect loop from https://xenforo.com/community/register/ to...

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