test: refactor: declare NoMalleation const auto
test: refactor: declare NoMalleation const auto

To avoid linker error on some platforms:
    https://github.com/bitcoin/bitcoin/pull/21526#discussion_r709404714

Co-authored-by: Russ Yanofsky <d1818e90f775d1fa111cabb0c1a59ce802530221@yanofsky.org>

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