Avoid losing error messages when inside a frame

lms/djangoapps/student_account/views.py

@@ -102,6 +102,7 @@ def login_and_registration_form(request, initial_mode="login"):
         'third_party_auth_hint': third_party_auth_hint or '',
         'platform_name': settings.PLATFORM_NAME,
         'responsive': True,
+        'allow_iframing': True,
 
         # Include form descriptions retrieved from the user API.
         # We could have the JS client make these requests directly,