Auto update cost item rates when enabling editing non-sor cost schedule

There was an issue that it wouldn't load until you manually select it in the "Cost Item Rates" enum - otherwise items didn't appear the first time cost schedule opened and didn't not update when you makes changes to the active schedule of rates.

src/bonsai/bonsai/core/cost.py

@@ -54,6 +54,8 @@ def enable_editing_cost_items(cost: tool.Cost, cost_schedule: ifcopenshell.entit
     cost.enable_editing_cost_items(cost_schedule)
     cost.load_active_schedule_columns()
     cost.load_cost_schedule_tree()
+    if not cost.is_active_schedule_of_rates() and (schedule_of_rates := cost.get_active_schedule_of_rates()):
+        cost.load_schedule_of_rates_tree(schedule_of_rates)
     cost.play_sound()
 
 

src/bonsai/bonsai/tool/cost.py

@@ -551,6 +551,14 @@ class Cost(bonsai.core.tool.Cost):
         props = bpy.context.scene.BIMCostProperties
         props.columns.remove(props.columns.find(name))
 
+    @classmethod
+    def get_active_schedule_of_rates(cls) -> Union[ifcopenshell.entity_instance, None]:
+        props = bpy.context.scene.BIMCostProperties
+        schedule_id = tool.Blender.get_enum_safe(props, "schedule_of_rates")
+        if schedule_id is None:
+            return
+        return tool.Ifc.get().by_id(int(schedule_id))
+
     @classmethod
     def expand_cost_item_rate(cls, cost_item: ifcopenshell.entity_instance) -> None:
         props = bpy.context.scene.BIMCostProperties