pg_amcheck: Keep trying to fix the tests.

Fix another example of non-portable option ordering in the tests.
Oversight in 2418927.

Mark Dilger

Discussion: https://postgr.es/m/C37D28BA-3BA3-4776-B812-17F05F3472D8@enterprisedb.com

Author: tglsfdc

src/bin/pg_amcheck/t/003_check.pl

@@ -468,7 +468,7 @@ ()
 	'pg_amcheck rejects garbage startblock');
 
 command_fails_like(
-	[ @cmd, 'db1', '-s', 's5', '--endblock', '1234junk' ],
+	[ @cmd, '-s', 's5', '--endblock', '1234junk', 'db1' ],
 	qr/invalid end block/,
 	'pg_amcheck rejects garbage endblock');