[Rust] Clippy - fix reduntant clone

[asfimport]

Was introduced in PR that was merged around the same time.

Reporter: Daniël Heres / @Dandandan
Assignee: Daniël Heres / @Dandandan

PRs and other links:

• GitHub Pull Request #8791

_{Note: This issue was originally created as ARROW-10756. Please see the migration documentation for further details.}

[asfimport]

Neville Dipale / @nevi-me:
Issue resolved by pull request 8791
#8791