Simplify reports controller code branching

app/controllers/admin/reports_controller.rb

@@ -21,14 +21,15 @@ module Admin
 
     def show
       @report = report_class.new(spree_current_user, params, render: false)
-      @rendering_options = rendering_options # also stores user preferences
+      @rendering_options = rendering_options
 
       show_report
     end
 
     def create
       @report = report_class.new(spree_current_user, params, render: true)
-      @rendering_options = rendering_options # also stores user preferences
+      @rendering_options = rendering_options
+      update_rendering_options
 
       render_in_background
     end

app/controllers/concerns/reports_actions.rb

@@ -88,13 +88,9 @@ module ReportsActions
         display_header_row: false
       }
     end
-    update_rendering_options
-    @rendering_options
   end
 
   def update_rendering_options
-    return unless request.post?
-
     @rendering_options.update(
       options: {
         fields_to_show: params[:fields_to_show],