amelioration(procedure.chorus): ajoute le form component pour le 'crud' du ChorusConfiguration

app/models/concerns/procedure_chorus_concern.rb

@@ -2,6 +2,10 @@ module ProcedureChorusConcern
   extend ActiveSupport::Concern
 
   included do
+    def chorus_configuration
+      @chorus_configuration ||= ChorusConfiguration.new(chorus)
+    end
+
     def chorusable?
       feature_enabled?(:chorus)
     end