test: fix flaky test-benchmark-misc

Allow zero results for short benchmark test.

PR-URL: https://github.com/nodejs/node/pull/17686
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-benchmark-misc.js

@@ -11,4 +11,4 @@ runBenchmark('misc', [
   'n=1',
   'type=extend',
   'val=magyarország.icom.museum'
-]);
+], { NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });