[twitter] fix duplicate ArkoseLogin check

forgot to replace this in 9e5d65fbf3

gallery_dl/extractor/twitter.py

@@ -1886,8 +1886,9 @@ def _login_impl(extr, username, password):
             raise exception.AuthenticationError("Login requires CAPTCHA")
         elif subtask == "DenyLoginSubtask":
             raise exception.AuthenticationError("Login rejected as suspicious")
-        elif subtask == "ArkoseLogin":
+        elif subtask == "LoginSuccessSubtask":
-            raise exception.AuthenticationError("No auth token cookie")
+            raise exception.AuthenticationError(
+                "No 'auth_token' cookie received")
         else:
             raise exception.StopExtraction("Unrecognized subtask %s", subtask)