lib: fix version check in tick processor

Introduced in 70832bc3 ("build: add V8 embedder version string".)

Fixes: https://github.com/nodejs/node/issues/16736
PR-URL: https://github.com/nodejs/node/pull/16769


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