[openssl/openssl] 0e1da9: Fix multistream test script 18

[Hugo Landau]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 0e1da9d7ec3c7dd2af49be0d9be3e0848c167608
      https://github.com/openssl/openssl/commit/0e1da9d7ec3c7dd2af49be0d9be3e0848c167608
  Author: Hugo Landau <hlandau at openssl.org>
  Date:   2023-06-28 (Wed, 28 Jun 2023)

  Changed paths:
    M test/quic_multistream_test.c

  Log Message:
  -----------
  Fix multistream test script 18

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21310)