Fix tryjob requirement compute failure

win-arm64-rel is under chromium/try, not chrome/try.

Change-Id: I8f3dfb6087ec137954b5162ed9645f73b6a3c76e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406194


Auto-Submit: Alan Zhao <ayzhao@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1279999}