bim.load_schedule_of_rates_tree - remove dead code

This operator is unused anymore since d3b176e and it's using non-existent core method.

src/bonsai/bonsai/bim/module/cost/__init__.py

@@ -67,7 +67,6 @@ classes = (
     operator.LoadCostItemTaskQuantities,
     operator.LoadCostItemTypes,
     operator.LoadProductCostItems,
-    operator.LoadScheduleOfRates,
     operator.RemoveCostColumn,
     operator.RemoveCostItem,
     operator.RemoveCostItemQuantity,

src/bonsai/bonsai/bim/module/cost/operator.py

@@ -629,17 +629,6 @@ class AssignCostValue(bpy.types.Operator, tool.Ifc.Operator):
         )
 
 
-class LoadScheduleOfRates(bpy.types.Operator):
-    bl_idname = "bim.load_schedule_of_rates_tree"
-    bl_label = "Load Schedule of Rates"
-    bl_options = {"REGISTER", "UNDO"}
-    cost_schedule: bpy.props.IntProperty()
-
-    def execute(self, context):
-        core.load_schedule_of_rates_tree(tool.Cost, schedule_of_rates=tool.Ifc.get().by_id(self.cost_schedule))
-        return {"FINISHED"}
-
-
 class ExpandCostItemRate(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "bim.expand_cost_item_rate"
     bl_label = "Expand Cost Item Rate"