Simplify new question form

In this form, the only case where `poll` might be present without
`question.poll` being present to is going to be the `new` action. We can
assign the poll in the `new` action and get rid of the `poll` variable
in the form.

app/components/admin/poll/questions/form_component.html.erb

@@ -8,9 +8,7 @@
 
   <div class="row">
     <div class="small-12">
-      <% if poll.present? %>
+      <% if question.poll.present? %>
-        <%= f.hidden_field :poll_id, value: poll.id %>
-      <% elsif question.poll.present? %>
         <%= f.hidden_field :poll_id, value: question.poll.id %>
       <% else %>
         <div class="small-12 medium-6 large-4 column">

app/components/admin/poll/questions/form_component.rb

@@ -1,10 +1,9 @@
 class Admin::Poll::Questions::FormComponent < ApplicationComponent
   include TranslatableFormHelper
   include GlobalizeHelper
-  attr_reader :poll, :question, :url
+  attr_reader :question, :url
 
-  def initialize(poll, question, url:)
+  def initialize(question, url:)
-    @poll = poll
     @question = question
     @url = url
   end

app/controllers/admin/poll/questions_controller.rb

@@ -16,6 +16,7 @@ class Admin::Poll::QuestionsController < Admin::Poll::BaseController
     @polls = Poll.all
     proposal = Proposal.find(params[:proposal_id]) if params[:proposal_id].present?
     @question.copy_attributes_from_proposal(proposal)
+    @question.poll = @poll
   end
 
   def create

app/views/admin/poll/questions/_form.html.erb

@@ -1 +1 @@
-<%= render Admin::Poll::Questions::FormComponent.new(@poll, @question, url: form_url) %>
+<%= render Admin::Poll::Questions::FormComponent.new(@question, url: form_url) %>