test: increase run time in test-worker-prof

This test has occasionally been failing on Windows since it
was added, with 6 instead of 15 ticks being seen.

Increasing the duration of the test should make it more reliable.

PR-URL: https://github.com/nodejs/node/pull/26172


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>