cmd/bent: remove repo information from rarely used benchmark configs

Repo information is now provided/updated in suites.toml, so it
does not belong in these files anymore.

Change-Id: I5ca1168b638f51eb9ecc087a91feeb6ad309633c
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/365716
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
3 files changed