benchmark: fix http/simple.js benchmark

autocannon appears to have trouble recognizing URLs that contain false or true within them. Use 0 or 1 instead to represent the same. Prior to this fix, autocannon would just print out its help instead of running the actual benchmark.

I'm guessing this also needs fixing in autocannon or whatever its using to parse arguments but for now I would like to get our http benchmark working again.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

benchmark