cmd/go/internal/work: remove deps[1]="fmt" vet hack
The Builder.vet operation has not needed an artificial
dependency on the fmt package since CL 176439 in 2019.
Remove it now.
Change-Id: I398a6d2d57175c12843520d9f19ffd023e676123
Reviewed-on: https://go-review.googlesource.com/c/go/+/702856
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>