Currently, flags are not being printed when users run `gopls help` because they
never get parsed in Main. This CL fixes that issue.
Updates golang/go#35855
Change-Id: Ic9882d0d2410a0f045aa0ecaa87b36c23eb569fd
Reviewed-on: https://go-review.googlesource.com/c/tools/+/330854
Trust: Jean de Klerk <deklerk@google.com>
Run-TryBot: Jean de Klerk <deklerk@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>