test: remove FLAKY status for test-http2-multistream-destroy-on-read-tls

The test does not seem to have failed since the issue was first reported
in 2019.

Closes: https://github.com/nodejs/node/issues/30845

PR-URL: https://github.com/nodejs/node/pull/37533
Fixes: https://github.com/nodejs/node/issues/30845


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>