test: fix pummel/test-exec
Fix test/pummel/test-exec.js which broke as a result of e47f972d (https://github.com/nodejs/node/pull/24951).
(Until very recently, pummel tests were not run at all in CI and currently only run nightly on master.)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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