[space] Login while registering returns to parent TeSS

[kennethrioja]

Describe the bug

Logging in while registering in a space returns the user to the parent TeSS, and not the space

To Reproduce

Steps to reproduce the behavior:

1. OIDC is enabled in the TeSS instance
2. User is not logged in, user is in the space
3. User clicks on 'Register training material'
4. They are in <space-url>/materials/new with the Log in page
5. They click on the institutional login (login via OIDC)
6. They successfully log in, BUT they return to the parent TeSS instance in <main-url>/materials/new.

Expected behavior

6. should be return to <space-url>/materials/new