Update RefrigerationCase ctor

Case defrost drip down schedule is not needed in ctor, if it is blank
then it uses case defrost schedule.
Update RefrigerationWalkIn ctor

This removes walkinDefrostDripDownSchedule from the required input
arguments in the ctor since if that schedule is blank then it uses the
walkinDefrostSchedule.
Remove OS IDD field from RefrigerationSystem

Remove Number of Compressor Stages since it is a redundant field.
Fix build error after IDD change