Fix impossible dmz_correct in dmz_lab

[tran-hai-long]

The difference between results.config and prestop script makes it impossible to get dmz_correct in dmz-lab. https://github.com/mfthomps/Labtainers/blob/4100f1f56504984ef413a8110d1f89a2e0de6259/labs/dmz-lab/instr_config/results.config#L14