internal/lsp: fix logged message for gc_details
internal/lsp: fix logged message for gc_details

Removes leftover debugging string from the message logged when
gc_details executes.

Change-Id: I802b276d1590e0b1e9793190990a1e576dc893ed
Reviewed-on: https://go-review.googlesource.com/c/tools/+/245417
Run-TryBot: Peter Weinberger <dd140fb9530d791057dd8833ea6768ff65fcde71@google.com>
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>

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