administrateur can add zone to procedure

app/views/administrateurs/procedures/_informations.html.haml

@@ -13,6 +13,11 @@
   %span.mandatory *
 = f.text_area :description, rows: '6', placeholder: 'Description de la démarche, destinataires, etc. ', class: 'form-control'
 
+= f.label :zone do
+  Organisme qui met en oeuvre la démarche
+  %span.mandatory *
+= f.collection_select :zone_id, Zone.order(:label), :id, :label, prompt: true
+
 %h3.header-subsection Logo de la démarche
 = image_upload_and_render f, @procedure.logo