Also fix incorrect config for Win32 goma cache silo builder

Win64 builders added in https://crrev.com/c/3779918

Bug: b:239780467
Change-Id: Ib65e486e478e2603b936d6a6620e9461a49698be
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3779917Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Richard Wang <richardwa@google.com>
Cr-Commit-Position: refs/heads/main@{#81880}