AMBARI-12516. Fix AlertDispatchDAOTest#testDeleteTargetWithNotices() test (dlysnichenko)

ambari-server/src/test/java/org/apache/ambari/server/orm/dao/AlertDispatchDAOTest.java

@@ -456,7 +456,6 @@ public class AlertDispatchDAOTest {
   *
   */
   @Test
-  @Ignore
   public void testDeleteTargetWithNotices() throws Exception {
     AlertTargetEntity target = m_helper.createAlertTarget();