Fix the host checks to only check against hostname.

Fixes https://github.com/etesync/etesync-web/issues/183
As discussed in #66
Continuation of 843b59a0ac.

django_etebase/views.py

@@ -708,7 +708,7 @@ class AuthenticationViewSet(viewsets.ViewSet):
         elif challenge_data["userId"] != user.id:
             content = {"code": "wrong_user", "detail": "This challenge is for the wrong user"}
             return Response(content, status=status.HTTP_400_BAD_REQUEST)
-        elif not settings.DEBUG and host.split(":", 1)[0] != request.get_host():
+        elif not settings.DEBUG and host.split(':', 1)[0] != request.get_host().split(':', 1)[0]:
             detail = 'Found wrong host name. Got: "{}" expected: "{}"'.format(host, request.get_host())
             content = {"code": "wrong_host", "detail": detail}
             return Response(content, status=status.HTTP_400_BAD_REQUEST)