Fixed test method usage

Author: Brord van Wierst

src/test/java/com/iota/iri/service/transactionpruning/PrunedTransactionVerifierImplTest.java

@@ -22,8 +22,8 @@
 
 public class PrunedTransactionVerifierImplTest {
 
-    private static final Hash A = TransactionTestUtils.getRandomTransactionHash();
-    private static final Hash B = TransactionTestUtils.getRandomTransactionHash();
+    private static final Hash A = TransactionTestUtils.getTransactionHash();
+    private static final Hash B = TransactionTestUtils.getTransactionHash();
 
     @Rule
     public MockitoRule mockitoRule = MockitoJUnit.rule();