rustfmt: apply style fixes

6 jobs for check_size-tests
Status Job ID Name Coverage
  External
passed kwrobot-branch-check

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

00:00:04