[libFuzzer] Don't count leak-verification re-executions towards `-runs` (#221036)

Fixes #66331. Stop countring the verification run in
TryDetectingAMemoryLeak() as part of TotalNumberOfRuns, as the number of
executed units could exceed -runs=N.

GitOrigin-RevId: 3ff11b27bbd8eca219dab55e9589fcf6a76a79cb
1 file changed