internal/lsp: fix recursive go generate pattern
internal/lsp: fix recursive go generate pattern

In CL 256941 I suggested using `go generate ...` to run all the
generates in the current directory and its subdirectories. That was
wrong: ... means all in-scope packages. The correct pattern is ./... .
Change-Id: I1cb4e6b7cfbcd9b8f943d7193e4aee216614cdff
Reviewed-on: https://go-review.googlesource.com/c/tools/+/269318
Trust: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Run-TryBot: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools