cmd/bench: run benchmark tests from gopls module

CL 453502 runs benchmark tests from tools module with gopls in test dir. Change to run benchmark tests within gopls module instead.

Change-Id: I1c8b2cdac29dcb414f5c3fe9435e320521e02388
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/457415
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Dylan Le <dungtuanle@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
1 file changed