Add type param to support form

app/controllers/support_controller.rb

@@ -26,6 +26,7 @@ class SupportController < ApplicationController
 
   def setup_context
     @dossier_id = dossier&.id
+    @type = params[:type]
     @tags = params[:tags]
     @options = Helpscout::FormAdapter::OPTIONS
   end

app/views/support/index.html.haml

@@ -20,7 +20,7 @@
         = label_tag :type do
           Votre problème
           %span.mandatory *
-        = select_tag :type, options_for_select(@options)
+        = select_tag :type, options_for_select(@options, @type)
 
       .contact-champ
         = label_tag :dossier_id, 'Numéro du dossier concerné'