Bug fix: prevents initPatient() being called twice when debug patients are spawned

Calling it twice when spawning debug patients can make male patients
look like females and vice versa, until they are told to stop standing
idle.

disease.initPatient() doesn't need to be called in
make_debug_patient.lua because its called by
patient:setDisease()
Merge pull request #170 from JASheppard/makeDebugPatient_bug_fix

make_debug_patient Bug fix: prevents initPatient() being called twice.