cmd/go: remove confusing TrimPrefix(str, "\n")
It's not clear why strings here would have a *prefix* \n. This trim
was introduced back in March 2012 without explanation in omnibus
commit
b03a5f66e8f8a6b36c9d67e82d2edc9b3d4076ba (as a HasPrefix, since
we didn't have TrimPrefix at the time).
Change-Id: Ib0a7af36900e437fdc52ec5c1c921f92833f6cef
Reviewed-on: https://go-review.googlesource.com/c/go/+/558638
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>