Remove retries from previously flaky specs

It's not acceptable to have flaky specs that only pass once in three
tries. Our specs might be more stable now that we use Chrome as test
browser. Otherwise we have to find out why these specs are not stable.
It might be an important bug that happens only sometimes.

spec/features/admin/orders_spec.rb

@@ -84,7 +84,7 @@ feature '
     expect(o.order_cycle).to eq(@order_cycle)
   end
 
-  scenario "can add a product to an existing order", retry: 3 do
+  scenario "can add a product to an existing order" do
     quick_login_as_admin
     visit '/admin/orders'
 

spec/features/admin/variant_overrides_spec.rb

@@ -426,7 +426,7 @@ feature "
           select2_select hub.name, from: 'hub_id'
         end
 
-        it "alerts the user to the presence of new products, and allows them to be added or hidden", retry: 3 do
+        it "alerts the user to the presence of new products, and allows them to be added or hidden" do
           expect(page).to have_no_selector "table#variant-overrides tr#v_#{variant1.id}"
           expect(page).to have_no_selector "table#variant-overrides tr#v_#{variant2.id}"
 

spec/features/consumer/shopping/checkout_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-feature "As a consumer I want to check out my cart", js: true, retry: 3 do
+feature "As a consumer I want to check out my cart", js: true do
   include AuthenticationWorkflow
   include ShopWorkflow
   include CheckoutWorkflow

spec/features/consumer/shopping/variant_overrides_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-feature "shopping with variant overrides defined", js: true, retry: 3 do
+feature "shopping with variant overrides defined", js: true do
   include AuthenticationWorkflow
   include WebHelper
   include ShopWorkflow