test: update extsort test to make it deterministic

we need to sort by more than one column

tests/test_extsort.rs

@@ -88,14 +88,15 @@ fn extsort_issue_2391() {
 
     let mut cmd = wrk.command("extsort");
     cmd.arg("issue2391-test_ids.csv")
-        .args(["--select", "tc_id"]);
+        .args(["--select", "tc_id,pnm"]);
 
     wrk.assert_success(&mut cmd);
     let got: Vec<Vec<String>> = wrk.read_stdout(&mut cmd);
     let expected = vec![
         svec!["pnm", "tc_id", "pc_id"],
         svec!["405", "139280", "9730000630075"],
         svec!["405", "139280", "9730000630075"],
+        svec!["138", "139282871", "9730065908379"],
         svec!["405", "139281", "9730000630075"],
         svec!["131", "139282862", "9730065908379"],
         svec!["138", "139282863", "9730065908379"],
@@ -106,7 +107,6 @@ fn extsort_issue_2391() {
         svec!["138", "139282868", "9730065908379"],
         svec!["138", "139282869", "9730065908379"],
         svec!["138", "139282870", "9730065908379"],
-        svec!["138", "139282871", "9730065908379"],
         svec!["252", "139282", "9730000630075"],
         svec!["241", "139283", "9730000630075"],
         svec!["272", "139284", "9730000630075"],