[ISSUE #376]Fix the selectorExpression not resolve placeholders. (#383)

Co-authored-by: zhangjidi2016 <zhangjidi@cmss.chinamobile.com>

Author: zhangjidi2016

rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/autoconfigure/ExtConsumerResetConfiguration.java

@@ -122,7 +122,7 @@ private DefaultLitePullConsumer createConsumer(ExtRocketMQConsumerConfiguration
         String accessChannel = resolvePlaceholders(annotation.accessChannel(), rocketMQProperties.getAccessChannel());
         MessageModel messageModel = annotation.messageModel();
         SelectorType selectorType = annotation.selectorType();
-        String selectorExpression = annotation.selectorExpression();
+        String selectorExpression = resolvePlaceholders(annotation.selectorExpression(), consumerConfig.getSelectorExpression());
         String ak = resolvePlaceholders(annotation.accessKey(), consumerConfig.getAccessKey());
         String sk = resolvePlaceholders(annotation.secretKey(), consumerConfig.getSecretKey());
         int pullBatchSize = annotation.pullBatchSize();