Add given_order to related poll question answers forms

Since given order is no longer being generated automatically we need
to add it to related forms and to strong parameters methods

app/controllers/admin/poll/questions/answers_controller.rb

@@ -50,7 +50,8 @@ class Admin::Poll::Questions::AnswersController < Admin::Poll::BaseController
 
     def answer_params
       documents_attributes = [:id, :title, :attachment, :cached_attachment, :user_id, :_destroy]
-      attributes = [:title, :description, :question_id, documents_attributes: documents_attributes]
+      attributes = [:title, :description, :given_order, :question_id,
+        documents_attributes: documents_attributes]
       params.require(:poll_question_answer).permit(*attributes, *translation_params(Poll::Question::Answer))
     end