[testing] update `test_longcat_generation_cpu` (#41368)
* fix
* Update tests/models/longcat_flash/test_modeling_longcat_flash.py
Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>
---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
Co-authored-by: Pablo Montalvo <39954772+molbap@users.noreply.github.com>