Correctly delegate to OrderUtils.getPriority for DecoratingProxy

Issue: SPR-16739

(cherry picked from commit 2f4010e)

spring-core/src/main/java/org/springframework/core/annotation/AnnotationAwareOrderComparator.java

@@ -107,7 +107,7 @@ public class AnnotationAwareOrderComparator extends OrderComparator {
 		}
 		Integer priority = OrderUtils.getPriority(obj.getClass());
 		if (priority == null && obj instanceof DecoratingProxy) {
-			priority = OrderUtils.getOrder(((DecoratingProxy) obj).getDecoratedClass());
+			priority = OrderUtils.getPriority(((DecoratingProxy) obj).getDecoratedClass());
 		}
 		return priority;
 	}