Aquifer water state variable not output to history when use_groundwater_irrigation is true

In WaterStateType, the history output for wa_col is only active when use_aquifer_layer is true. It should also be output when use_groundwater_irrigation is true. This is not straightforward to implement, because use_groundwater_irrigation is a private parameter in IrrigationMod, so some way of passing the value of use_groundwater_irrigation to WaterStateType is needed. Until then, users running with active groundwater irrigation will not have history output for WA (the water in the aquifer).