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copies-rust: remove an unnecessary format!() inside assert!()

Authored by martinvonz.

Description

copies-rust: remove an unnecessary format!() inside assert!()

The assert!() macro supports formatting. Rust 2021 no longer
supports an unnecessary format!() inside it. I noticed because I
recently update my Rust toolchain and test-check-cargo-lock.t
started failing.

Differential Revision: https://phab.mercurial-scm.org/D10085