Fix Data_Generator.generate_setpoints

[dhblum]

This issue is to fix Lines 466 and 468 of data/data_generator.py so that the correct occupied and unoccupied set points are used when generating set point data for resource csvs. A quick check reveals that none of the current test cases utilize this functionality. The coming single_zone_commercial hydronic in #160 utilizes it, but that set point data needs to be changed anyway to using model data to consider weekends.

So this is mainly precautionary for future use cases to just get it right.

[dhblum]

Closed by #370.