[openssl/openssl] cf424d: Fix instructions for running tests on Windows

[Dmitry Kobets]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: cf424d1da05b3cd928c97596af08e260429b308c
      https://github.com/openssl/openssl/commit/cf424d1da05b3cd928c97596af08e260429b308c
  Author: Dmitry Kobets <89153909+dmitrykobets-msft at users.noreply.github.com>
  Date:   2023-12-18 (Mon, 18 Dec 2023)

  Changed paths:
    M test/README.md

  Log Message:
  -----------
  Fix instructions for running tests on Windows

In the command `nmake TEST='foo' test`, on Windows the runner
will look for test `'foo'` and complain about the test not being found
(due to the extraneous single quotes), whereas with `nmake TEST="foo" test`,
the test `foo` will be correctly found.

CLA: trivial

Reviewed-by: Tom Cosgrove <tom.cosgrove at arm.com>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre at ncp-e.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23059)