Move "Windows deterministic" to chromium.win in cr-buildbucket.cfg too

https://chromium-review.googlesource.com/c/1295272 moved the bot on the
console and updated mb_config.pyl. But once the bot had synced in the
mb_config.pyl change, it started failing with

  lookup GN args Failed to extract GN args from output of "mb lookup"

The lookup step still passes in `-m chromium.fyi`, and due to the mb_config.pyl
change that no longer works.

My best guess is that the mastername comes from the cr-buildbucket.cfg file,
so change the master here too. (Seems like a nice thing to do in general.)

TBR=dpranke

Bug: 897980
Change-Id: I95fe0b7470ec39eb8ebfd0dc5a57980d598b0e46
Reviewed-on: https://chromium-review.googlesource.com/c/1297262Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602285}

infra/config/global/cr-buildbucket.cfg

@@ -1554,6 +1554,12 @@ buckets {
       dimensions: "cpu:x86-64"
       dimensions: "cores:8"
     }
+    builders {
+      name: "Windows deterministic"
+      dimensions: "os:Windows-10"
+      mixins: "win-ci"
+      mixins: "deterministic"
+    }
 
     # chromium.clang
     builders {
@@ -2433,12 +2439,6 @@ buckets {
       dimensions: "os:Ubuntu-14.04"
       mixins: "fyi-ci"
     }
-    builders {
-      name: "Windows deterministic"
-      dimensions: "os:Windows-10"
-      mixins: "fyi-ci"
-      mixins: "deterministic"
-    }
     builders {
       name: "Linux ARM"
       dimensions: "os:Ubuntu-14.04"