We still need to pass -mod=mod when AllowModfileModifications is enabled
on 1.16.
Change-Id: I9cecd30914eb52c9faa877cece25d5722b36df79
Reviewed-on: https://go-review.googlesource.com/c/tools/+/289695
Trust: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>