Test: Give "Receive" button more time to render

This is a flaky test, so give Capybara it bit more time
to find the button.

backend/spec/features/admin/orders/customer_returns_spec.rb

@@ -50,7 +50,7 @@ def expect_order_state_label_to_eq(text)
         within('[data-hook="rejected_return_items"] tbody tr:nth-child(1)') do
           click_button('Receive')
 
-          expect(page).to have_button("Receive", disabled: true)
+          expect(page).to have_button("Receive", disabled: true, wait: 5)
         end
       end