specify time of day instead of abm_model in settings

[bricegnichols]

Update db inputs to use this number of time periods explicitly instead of relying on the abm name so we can run 5 time periods of daysim.

https://github.com/psrc/soundcast/blob/master/scripts/trucks/truck_model.py#L419

Note that we have made some changes on the asim branch but it does not seem robust as is (time periods overlap like 18to20)