Don't run desugar head bot on every commit

Change-Id: I8cb5ac823886522c2b91cbfaab4957cb052b7fa1
diff --git a/infra/config/global/luci-scheduler.cfg b/infra/config/global/luci-scheduler.cfg
index b782dbe..f819ee4 100644
--- a/infra/config/global/luci-scheduler.cfg
+++ b/infra/config/global/luci-scheduler.cfg
@@ -150,7 +150,6 @@
   acl_sets: "default"
   triggering_policy: {
     max_concurrent_invocations: 1
-    max_batch_size: 1
   }
   buildbucket {
     server: "cr-buildbucket.appspot.com"