HHH-18621 fix an incorrectly-written test

Author: gavinking

hibernate-core/src/test/java/org/hibernate/orm/test/hql/NaturalIdDereferenceTest.java

@@ -369,7 +369,7 @@ public static class BookRef {
 		private Long id;
 
 		@ManyToOne(optional = true)
-		@JoinColumn(nullable = true, columnDefinition = "id_ref")
+		@JoinColumn(nullable = true, name = "id_ref")
 		private Book normalBook;
 
 		@ManyToOne
@@ -387,7 +387,7 @@ public static class BookRefRef {
 		private Long id;
 
 		@ManyToOne
-		@JoinColumn(nullable = true, columnDefinition = "id_ref_ref")
+		@JoinColumn(nullable = true, name = "id_ref_ref")
 		private BookRef normalBookRef;
 
 		@ManyToOne