Fix pgbench TAP test.

Bildfarm member prairiedog reported a pgbench TAP test failure after
commit: 4a39f87acd. This commit attempts
to fix some copy&paste errors introduced in the previous commit.

Author: Yugo Nagata
Reported-by: Tom Lane
Discussion: https://postgr.es/m/2775989.1648060014%40sss.pgh.pa.us

src/bin/pgbench/t/001_pgbench_with_server.pl

@@ -1222,7 +1222,8 @@ local $ENV{PGOPTIONS} = "-c default_transaction_isolation=repeatable\\ read";
 # Check that we have a serialization error and the same random value of the
 # delta variable in the next try
 my $err_pattern =
-    "client (0|1) got an error in command 3 \\(SQL\\) of script 0; "
+	"(client (0|1) sending UPDATE xy SET y = y \\+ -?\\d+\\b).*"
+  . "client \\g2 got an error in command 3 \\(SQL\\) of script 0; "
   . "ERROR:  could not serialize access due to concurrent update\\b.*"
   . "\\g1";