Remove specs testing filtering of master variants

Master variants are not used in the report

lib/open_food_network/products_and_inventory_report_base.rb

@@ -36,7 +36,6 @@ module OpenFoodNetwork
     end
 
     # Using the `in_stock?` method allows overrides by distributors.
-    # It also allows the upgrade to Spree 2.0.
     def filter_on_hand(variants)
       if params[:report_type] == 'inventory'
         variants.select(&:in_stock?)

spec/lib/open_food_network/products_and_inventory_report_spec.rb

@@ -97,18 +97,7 @@ module OpenFoodNetwork
 
       describe "Filtering variants" do
         let(:variants) { Spree::Variant.where(nil).joins(:product).where(is_master: false) }
-        it "should return unfiltered variants sans-params" do
-          product1 = create(:simple_product, supplier: supplier)
-          product2 = create(:simple_product, supplier: supplier)
 
-          expect(subject.filter(Spree::Variant.where(nil))).to match_array [product1.master, product1.variants.first, product2.master, product2.variants.first]
-        end
-        it "should filter deleted products" do
-          product1 = create(:simple_product, supplier: supplier)
-          product2 = create(:simple_product, supplier: supplier)
-          product2.destroy
-          expect(subject.filter(Spree::Variant.where(nil))).to match_array [product1.master, product1.variants.first]
-        end
         describe "based on report type" do
           it "returns only variants on hand" do
             product1 = create(:simple_product, supplier: supplier, on_hand: 99)