Update chunk_size.t. Don't update progress if progress is disabled.

t/pt-table-checksum/basics.t

@@ -36,7 +36,6 @@ else {
 
 # The sandbox servers run with lock_wait_timeout=3 and it's not dynamic
 # so we need to specify --lock-wait-timeout=3 else the tool will die.
-
 my $master_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox';
 my @args       = ($master_dsn, qw(--lock-wait-timeout 3));