Fix legislation options not being updated

We broke this behaviour by introducing translations and not allowing the
`id` parameter anymore.

app/controllers/admin/legislation/questions_controller.rb

@@ -47,7 +47,7 @@ class Admin::Legislation::QuestionsController < Admin::Legislation::BaseControll
     def question_params
       params.require(:legislation_question).permit(
         translation_params(::Legislation::Question),
-        question_options_attributes: [translation_params(::Legislation::QuestionOption)])
+        question_options_attributes: [:id, translation_params(::Legislation::QuestionOption)])
     end
 
     def resource

spec/features/admin/legislation/questions_spec.rb

@@ -113,11 +113,8 @@ feature 'Admin legislation questions' do
     end
   end
 
-  context "Special translation behaviour" do
-
-    let!(:question) { create(:legislation_question,
-                             title_en: "Title in English",
-                             title_es: "Título en Español") }
+  context "Legislation options" do
+    let!(:question) { create(:legislation_question) }
 
     let(:edit_question_url) do
       edit_admin_legislation_process_question_path(question.process, question)
@@ -132,6 +129,24 @@ feature 'Admin legislation questions' do
       end
     end
 
+    scenario "Edit an existing option", :js do
+      create(:legislation_question_option, question: question, value: "Original")
+
+      visit edit_question_url
+      find("#nested-question-options input").set("Changed")
+      click_button "Save changes"
+
+      expect(page).not_to have_css "#error_explanation"
+
+      visit edit_question_url
+      expect(page).to have_field(field_en[:id], with: "Changed")
+    end
+
+    context "Special translation behaviour" do
+      before do
+        question.update_attributes(title_en: "Title in English", title_es: "Título en Español")
+      end
+
       scenario 'Add translation for question option', :js do
         visit edit_question_url
 
@@ -177,4 +192,5 @@ feature 'Admin legislation questions' do
         expect(page).to have_field(field_es[:id], with: 'Opción 1')
       end
     end
+  end
 end