MDEV-25912 wsrep does not identify checksummed events correctly

For GTID consistenty, GTID events was artificialy added before
replication happned. This event should not contain CHECKSUM calculated.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

sql/log.cc

@@ -5735,6 +5735,8 @@ THD::binlog_start_trans_and_stmt()
                             this->variables.gtid_domain_id,
                             true, LOG_EVENT_SUPPRESS_USE_F,
                             true, 0);
+      // Replicated events in writeset doesn't have checksum
+      gtid_event.checksum_alg= BINLOG_CHECKSUM_ALG_OFF;
       gtid_event.server_id= this->variables.server_id;
       writer.write(&gtid_event);
     }