Adjust recently added test for pg_signal_autovacuum role

This test was added by commit d2b74882ca, but fails if
log_error_verbosity is set to verbose. Adjust the regex that checks the
error message to allow for it containing an SQL status code.

src/test/modules/test_misc/t/006_signal_autovacuum.pl

@@ -84,7 +84,7 @@ $node->poll_query_until('postgres',
 # Check that the primary server logs a FATAL indicating that autovacuum
 # is terminated.
 ok( $node->log_contains(
-		qr/FATAL:  terminating autovacuum process due to administrator command/,
+		qr/FATAL: .*terminating autovacuum process due to administrator command/,
 		$offset),
 	"autovacuum worker signaled with pg_signal_autovacuum_worker granted");