Remove unused attribute

#772

test/integration/registrar/billing/balance_top_up_test.rb

@@ -0,0 +1,16 @@
+require 'test_helper'
+
+class BalanceTopUpTest < ActionDispatch::IntegrationTest
+  def setup
+    login_as users(:api_bestnames)
+  end
+
+  def test_registrar_balance_top_up
+    visit registrar_invoices_url
+    click_link_or_button 'Add deposit'
+    fill_in 'Amount', with: 100
+    click_link_or_button 'Add'
+
+    assert_text 'Please pay the following invoice'
+  end
+end