Make the dawn-try-win10-x86-rel trybot includable

So manual builds can be triggered against it.

Change-Id: Ib47bf7bf4a74cef4aebf57e95f3b1c23694a5509
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87669
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>

infra/config/global/generated/commit-queue.cfg

@@ -26,6 +26,10 @@ config_groups {
       dry_run_access_list: "project-dawn-tryjob-access"
     }
     tryjob {
+      builders {
+        name: "chromium/try/dawn-try-win10-x86-rel"
+        includable_only: true
+      }
       builders {
         name: "chromium/try/linux-dawn-rel"
       }