Fix typo in virtlet-ds.yaml

Revert back removed mode for virtlet ServiceAccount

Change-Id: If87a05b017645ab9e36cd47133614dd6dd9cdf29
diff --git a/kubernetes/files/kube-addons/virtlet/virtlet-ds.yml b/kubernetes/files/kube-addons/virtlet/virtlet-ds.yml
index a222703..d1799bb 100644
--- a/kubernetes/files/kube-addons/virtlet/virtlet-ds.yml
+++ b/kubernetes/files/kube-addons/virtlet/virtlet-ds.yml
@@ -434,6 +434,8 @@
   creationTimestamp: null
   name: virtlet
   namespace: {{ common.addons.virtlet.namespace }}
+  labels:
+    addonmanager.kubernetes.io/mode: Reconcile
 ---
 apiVersion: v1
 data: