regression in bench_reissue_100_to_1. reissue fails with error FailedUnblinding

[dan-da]

With latest sn_dbc (635bf14 release 2.4.0) I get the following error when running cargo bench:

$ cargo bench merge
...
Benchmarking reissue merge 100 to 1: Warming up for 3.0000 sthread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: FailedUnblinding', benches/reissue.rs:227:18
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: bench failed

I used git bisect to trace this back to the commit where it first occurred, which is:

commit 980c55f7a9e680d3702a7a02e6e908be5e6cf9f2
Author: David Rusu <drusu@Davids-MacBook-Air.local>
Date:   Fri Aug 13 13:51:14 2021 -0600

    chore: from_iter(vec![..]) to from_iter([..])

M       benches/reissue.rs
M       examples/mint-repl/mint-repl.rs
M       src/dbc.rs
M       src/lib.rs
M       src/mint.rs

I do not immediately see what the problem is, else I would have just fixed it.

[davidrusu]

should be fixed in #77