Revert "[ISSUE #9176] Fix pop message header missing fields when enable ACL 2…" (#9211)

This reverts commit 5ca4dfe.

Author: lizhimins

broker/src/main/java/org/apache/rocketmq/broker/processor/PopMessageProcessor.java

@@ -234,7 +234,6 @@ public RemotingCommand processRequest(final ChannelHandlerContext ctx, RemotingC
         final PopMessageRequestHeader requestHeader =
             request.decodeCommandCustomHeader(PopMessageRequestHeader.class, true);
         final PopMessageResponseHeader responseHeader = (PopMessageResponseHeader) response.readCustomHeader();
-        requestHeader.setBornTime(System.currentTimeMillis());
 
         // Pop mode only supports consumption in cluster load balancing mode
         brokerController.getConsumerManager().compensateBasicConsumerInfo(