benchmark: fix http/simple.js benchmark

autocannon appears to have trouble recognizing URLs that contain true
or false within them. Use 0 or 1 instead to represent the same.

PR-URL: https://github.com/nodejs/node/pull/17583


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>