[#4183] HourlyDeliverable#total (budget) should only include labor budget.

app/models/hourly_deliverable.rb

@@ -19,8 +19,7 @@ class HourlyDeliverable < Deliverable
     return 0 if contract.billable_rate.blank?
     return 0 if labor_budgets.count == 0 && overhead_budgets.count == 0
 
-    hours = labor_budgets.sum(:hours) + overhead_budgets.sum(:hours)
-    return contract.billable_rate * hours
+    return contract.billable_rate * labor_budgets.sum(:hours)
   end
   
   # Block setting the total on HourlyDeliverables