replaced findUnique by "default" method in interfaces. (#1124)

src/main/java/io/ebeaninternal/server/querydefn/DefaultOrmQuery.java

@@ -1265,11 +1265,6 @@ public class DefaultOrmQuery<T> implements SpiQuery<T> {
     return server.findOneOrEmpty(this, null);
   }
 
-  @Override
-  public T findUnique() {
-    return findOne();
-  }
-
   @Override
   public FutureIds<T> findFutureIds() {
     return server.findFutureIds(this, null);