Replace the Mac fuzz bot on chromium.fuzz w/ the working buildbot version.

The luci version is currently broken. Will switch it back when bug 790372
is fixed.

Bug: 907542, 790372
Change-Id: Ic51139317f7a330ee9bd719b97cfb111154b7da2
Reviewed-on: https://chromium-review.googlesource.com/c/1347056Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610118}

infra/config/global/luci-milo.cfg

@@ -1514,7 +1514,7 @@ consoles {
     short_name: "linux-ubsan"
   }
   builders {
-    name: "buildbucket/luci.chromium.ci/Libfuzzer Upload Mac ASan"
+    name: "buildbot/chromium.fyi/Libfuzzer Upload Mac ASan"
     category: "libfuzz"
     short_name: "mac-asan"
   }