indicate registration URL is coming from france connect module

src/authentic2_auth_fc/views.py

@@ -398,6 +398,7 @@ class RegistrationView(LoggerMixin, View):
             return HttpResponseRedirect("{}?token={}".format(reverse('registration_register'),
                                                              signing.dumps(data)))
         data['valid_email'] = False
+        data['franceconnect'] = True
         activation_url = \
             a2_utils.build_activation_url(request,
                                           next_url=redirect_to,