Fix //sandbox/linux PRESUBMIT for android_arm64_dbg_recipe.

The builder is now on LUCI rather than the legacy buildbot master.

Change-Id: I5ccaaa9dc317211daee8348f61b9eda068018314
Reviewed-on: https://chromium-review.googlesource.com/1188616Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585897}

sandbox/linux/PRESUBMIT.py

@@ -27,7 +27,7 @@ def PostUploadHook(cl, change, output_api):
   return output_api.EnsureCQIncludeTrybotsAreAdded(
       cl,
       [
-        'master.tryserver.chromium.android:android_arm64_dbg_recipe',
+        'luci.chromium.try:android_arm64_dbg_recipe',
         'master.tryserver.chromium.android:android_compile_x64_dbg',
         'master.tryserver.chromium.android:android_compile_x86_dbg',
       ],