Load all the published budgets in the valuation interface

As now multiple budget can coexist at the same time it has sense to be able to
browse all the published budgets in the valuation budgets index page.

app/controllers/valuation/budgets_controller.rb

@@ -5,6 +5,6 @@ class Valuation::BudgetsController < Valuation::BaseController
   load_and_authorize_resource
 
   def index
-    @budget = current_budget
+    @budgets = @budgets.published.order(created_at: :desc)
   end
 end