update rake task

lib/tasks/set_decrypted_private_body.rake

@@ -3,15 +3,10 @@
 namespace :decidim do
   desc "Set decrypted_private_body to existing extra fields"
   task set_decrypted_private_body: :environment do
-    extra_fields = Decidim::DecidimAwesome::ProposalExtraField.where(decrypted_private_body: nil).where.not(private_body: nil)
-    if extra_fields.any?
-      p "Extra fields to update: #{extra_fields.size}"
-      count = 0
-      extra_fields.find_each do |extra_field|
-        extra_field.update(decrypted_private_body: extra_field.private_body.to_s)
-        count += 1 if extra_field.decrypted_private_body_previous_change.present?
-      end
-      p "Extra fields updated: #{count}"
+    if Rails.env.development?
+      PrivateBodyDecryptJob.perform_now
+    else
+      PrivateBodyDecryptJob.perform_later
     end
   end
 end