Fix bulk coop report

lib/reporting/reports/bulk_coop/base.rb

@@ -22,7 +22,7 @@ module Reporting
           [
             {
               order: [:bill_address],
-              variant: { product: :supplier }
+              variant: [:product, :supplier]
             }
           ]
         end

spec/lib/reports/bulk_coop_report_spec.rb

@@ -122,7 +122,7 @@ module Reporting
                                ship_address: create(:address))
               end
               let(:li2) do
-                build(:line_item_with_shipment, product: create(:simple_product, supplier: s1))
+                build(:line_item_with_shipment, variant: create(:variant, supplier: s1))
               end
 
               before do
@@ -144,7 +144,7 @@ module Reporting
                                ship_address: create(:address))
               end
               let(:li2) do
-                build(:line_item_with_shipment, product: create(:simple_product, supplier: s1))
+                build(:line_item_with_shipment, variant: create(:variant, supplier: s1))
               end
 
               before do