Remove unused Gateway.current method

The 'super' method referenced here doesn't exist.  It was removed in:
solidusio@df32600

core/app/models/spree/gateway.rb

@@ -11,11 +11,6 @@ def payment_source_class
  CreditCard
  end
 
- # instantiates the selected gateway and configures with the options stored in the database
- def self.current
- super
- end
-
  def provider
  gateway_options = options
  gateway_options.delete :login if gateway_options.key?(:login) && gateway_options[:login].nil?

sample/db/samples/payments.rb

@@ -1,13 +1,6 @@
 # create payments based on the totals since they can't be known in YAML (quantities are random)
 method = Spree::PaymentMethod.where(name: 'Credit Card', active: true).first
 
-# Hack the current method so we're able to return a gateway without a RAILS_ENV
-Spree::Gateway.class_eval do
- def self.current
- Spree::Gateway::Bogus.new
- end
-end
-
 # This table was previously called spree_creditcards, and older migrations
 # reference it as such. Make it explicit here that this table has been renamed.
 Spree::CreditCard.table_name = 'spree_credit_cards'