Fix distribution export performance regression

Author: coalest

app/controllers/distributions_controller.rb

@@ -69,7 +69,7 @@ def index
     respond_to do |format|
       format.html
       format.csv do
-        send_data Exports::ExportDistributionsCSVService.new(distributions: @distributions, organization: current_organization, filters: scope_filters).generate_csv, filename: "Distributions-#{Time.zone.today}.csv"
+        send_data Exports::ExportDistributionsCSVService.new(distributions: @distributions.includes(line_items: :item), organization: current_organization, filters: scope_filters).generate_csv, filename: "Distributions-#{Time.zone.today}.csv"
       end
     end
   end