test: fix TestHandshakeReplayXXX tests w/ count >= 2

[aeddi]

Fixes #5115

I'm not sure this fix is good, even if it does solve the count issue.
These tests could use a proper refactor and some comments to understand how they work.

It's complicated to understand the flow and the original intention in this area with the config global var, the config local var (parameter), the sim.Config, and the role of testConfig beyond just removing its root.

[Gno2D2]

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[jefft0]

This works for me with -count=2 . I can't comment on whether the fix is correct.