Remove unneeded code

Works without Referer. This allows to eliminate a hardcoded URL path.

KeRS/settings.py

@@ -159,5 +159,4 @@ OAUTH = {
     'REDIRECT_URI':     f'{BASE_URL}/login/zeus/authorized',
     'CLIENT_ID':        os.getenv('OAUTH_CLIENT_ID', 'tomtest'),
     'CLIENT_SECRET':    os.getenv('OAUTH_CLIENT_SECRET', 'blargh'),
-    'REFERER':          f'{BASE_URL}/login/zeus/register'
 }

oauth/views.py

@@ -64,8 +64,7 @@ def get_access_token(code):
               'grant_type': 'authorization_code',
               'client_id': settings.OAUTH["CLIENT_ID"],
               'client_secret': settings.OAUTH["CLIENT_SECRET"],
-              'redirect_uri': settings.OAUTH["REDIRECT_URI"]},
-        headers={'Referer': settings.OAUTH["REFERER"]})
+              'redirect_uri': settings.OAUTH["REDIRECT_URI"]})
     if response.status_code != 200:
         raise OAuthException(
             f'Status code {response.status_code} when requesting access token.\nresponse: {response.text}')