src: fix typo in NODE_OPTIONS whitelist

The whitelist of allowed cli flags that can be passed in the
NODE_OPTIONS environment variable had --trace-events-categories,
but the cli flag is actually --trace-event-categories.

PR-URL: https://github.com/nodejs/node/pull/17369


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>