Remove (nonfunctioning) back_url-check

aleksis/apps/alsijil/views.py

@@ -68,13 +68,6 @@ def full_register_for_group(request: HttpRequest, ids: str) -> HttpResponse:
     )
 
     back_url = request.GET.get("back", "")
-    back_url_is_safe = url_has_allowed_host_and_scheme(
-        url=back_url,
-        allowed_hosts={request.get_host()},
-        require_https=request.is_secure(),
-    )
-    if not back_url_is_safe:
-        back_url = reverse("my_groups")
 
     return render_progress_page(
         request,