test fix

Author: marcgrue

examples/src/test/scala/scaladci/examples/MoneyTransfer1.scala

@@ -132,7 +132,6 @@ class MoneyTransfer1 extends Specification {
     Source.withdraw
 
     role(Source) {
-      def decreaseBalance(amount: Int) = 7
       def withdraw {
         Source.decreaseBalance(amount)
         Destination.deposit