Remove duplicate entry in luci-scheduler.cfg.

Change-Id: Ia414bb22cb304d3701dd7c3191376ffe05651088
Reviewed-on: https://chromium-review.googlesource.com/c/1286869Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600411}

infra/config/global/luci-scheduler.cfg

@@ -812,16 +812,6 @@ job {
   }
 }
 
-job {
-  id: "android-kitkat-arm-rel"
-  acl_sets: "default"
-  buildbucket: {
-    server: "cr-buildbucket.appspot.com"
-    bucket: "luci.chromium.ci"
-    builder: "android-kitkat-arm-rel"
-  }
-}
-
 job {
   id: "android-marshmallow-arm64-rel"
   acl_sets: "default"