Re-define state machine before all state_machine_specs

This is due to it being altered in the checkout_spec which runs before it

core/spec/models/order/state_machine_spec.rb

@@ -3,6 +3,8 @@
 describe Spree::Order do
   let(:order) { Spree::Order.new }
   before do
+    # Ensure state machine has been re-defined correctly
+    Spree::Order.define_state_machine!
     # We don't care about this validation here
     order.stub(:require_email)
   end