fix test

Signed-off-by: Wenqi Mou <[email protected]>

Author: Tristan1900

br/tests/br_pitr/run.sh

@@ -71,8 +71,8 @@ incremental_delete_range_count=$(run_sql "select count(*) DELETE_RANGE_CNT from
 echo "incremental_delete_range_count: $incremental_delete_range_count"
 
 # wait checkpoint advance
-. "$CUR/../br_test_utils.sh" && wait_log_checkpoint_advance $TASK_NAME
 current_ts=$(python3 -c "import time; print(int(time.time() * 1000) << 18)")
+. "$CUR/../br_test_utils.sh" && wait_log_checkpoint_advance $TASK_NAME
 
 # dump some info from upstream cluster
 # ...