Fix daily hydropower modeling

Author: phumthep

src/pownet/builder/hydro.py

@@ -109,7 +109,7 @@ def add_constraints(self, step_k: int, init_conds: dict, **kwargs) -> None:
             unit_type="hydro",
             timesteps=self.timesteps,
             step_k=step_k,
-            units=self.inputs.hydro_units,
+            units=self.inputs.hydro_unit_node.keys(),
             capacity_df=self.inputs.hydro_capacity,
         )
         # Daily upper bound
@@ -143,7 +143,7 @@ def update_constraints(self, step_k: int, init_conds: dict, **kwargs) -> None:
             unit_type="hydro",
             timesteps=self.timesteps,
             step_k=step_k,
-            units=self.inputs.hydro_units,
+            units=self.inputs.hydro_unit_node.keys(),
             capacity_df=self.inputs.hydro_capacity,
         )