MINOR: fix the way total consumed is calculated for verifiable consumer (#9143)
MINOR: fix the way total consumed is calculated for verifiable consumer (#9143)

Reviewers: Ron Dagostino <b887117fce1ca479d081c9df08cdd6ef8fe8f2ca@confluent.io>, Rajini Sivaram <rajinisivaram@googlemail.com>
guozhangwang/kafka,guozhangwang/kafka,Chasego/kafka,TiVo/kafka,TiVo/kafka,Chasego/kafka,Chasego/kafka,apache/kafka,guozhangwang/kafka,TiVo/kafka,lindong28/kafka,Chasego/kafka,apache/kafka,TiVo/kafka,guozhangwang/kafka,lindong28/kafka,lindong28/kafka,apache/kafka,lindong28/kafka,apache/kafka