src: fix incorrect macro comment

Commit de168b4b ("src: guard
bundled_ca/openssl_ca with HAVE_OPENSSL") included an incorrect end
macro comment which this commit fixes.

PR-URL: https://github.com/nodejs/node/pull/12688



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