Fix buildfarm failure from commit 8fcd80258b.

The test case was incorrectly matching the error code.

Author: Vignesh C
Discussion: https://postgr.es/m/CALDaNm0C5LPiTxkdqsxiyeaL=nuUP8t6ne81sp9jE0=MFz=-ew@mail.gmail.com

src/test/subscription/t/011_generated.pl

@@ -361,7 +361,7 @@ $node_subscriber->safe_psql(
 # Verify that an error occurs.
 my $offset = -s $node_subscriber->logfile;
 $node_subscriber->wait_for_log(
-	qr/ERROR: ( [A-Z0-9]:)? logical replication target relation "public.t1" has incompatible generated columns: "c2", "c3"/,
+	qr/ERROR: ( [A-Z0-9]+:)? logical replication target relation "public.t1" has incompatible generated columns: "c2", "c3"/,
 	$offset);
 
 # cleanup