fix typo in model_checks.py
fix typo in model_checks.py

Fix a typo introduced a while back that no one caught prior to now
magfest/ubersystem,RAMSProject/rams,RAMSProject/rams,magfest/ubersystem,md1024/rams,md1024/rams,magfest/ubersystem,md1024/rams,RAMSProject/rams,magfest/ubersystem