Update ReportsController for background reports

As it turns out, the background reports were missing a small feature to
store user preferences. Yay specs!

app/controllers/admin/reports_controller.rb

@@ -26,6 +26,8 @@ module Admin
         .enabled?(:background_reports, spree_current_user)
 
       if @background_reports && request.post?
+        rendering_options # stores user preferences
+
         return background(report_format)
       end
 

spec/base_spec_helper.rb

@@ -98,7 +98,6 @@ RSpec.configure do |config|
     Flipper.disable(:background_reports) if example.file_path.in?(
       [
         # rubocop:disable Layout/LineLength
-        "./spec/controllers/admin/reports_controller_spec.rb",
         "./spec/system/admin/reports/enterprise_fee_summaries_spec.rb",
         "./spec/system/admin/reports/enterprise_summary_fees/enterprise_summary_fee_with_tax_report_by_order_spec.rb",
         "./spec/system/admin/reports/enterprise_summary_fees/enterprise_summary_fee_with_tax_report_by_producer_spec.rb",

spec/controllers/admin/reports_controller_spec.rb

@@ -309,7 +309,7 @@ describe Admin::ReportsController, type: :controller do
       controller_login_as_enterprise_user [coordinator1]
     end
 
-    it 'renders the delivery report' do
+    it "triggers the delivery report" do
       spree_post :show, {
         q: { completed_at_lt: 1.day.ago },
         shipping_method_in: ["123"], # We just need to search for shipping methods
@@ -317,7 +317,7 @@ describe Admin::ReportsController, type: :controller do
         report_subtype: "delivery",
       }
 
-      expect(response).to have_http_status(:ok)
+      expect(response).to have_http_status(:no_content)
     end
   end