manager: allow hidden procedures to be searched

The Manager::DossiersController already allow hidden dossiers to be
searched and displayed. Give the same behavior to Procedures.

app/controllers/manager/procedures_controller.rb

@@ -1,5 +1,21 @@
 module Manager
   class ProceduresController < Manager::ApplicationController
+    #
+    # Administrate overrides
+    #
+
+    # Override this if you have certain roles that require a subset
+    # this will be used to set the records shown on the `index` action.
+    def scoped_resource
+      if unfiltered_list?
+        # Don't display deleted dossiers in the unfiltered list…
+        Procedure
+      else
+        # … but allow them to be searched and displayed.
+        Procedure.unscope(:where)
+      end
+    end
+
     def whitelist
       procedure.whitelist!
       flash[:notice] = "Démarche whitelistée."
@@ -55,5 +71,9 @@ module Manager
     def type_de_champ_params
       params.require(:type_de_champ).permit(:piece_justificative_template)
     end
+
+    def unfiltered_list?
+      action_name == "index" && !params[:search]
+    end
   end
 end