[linux] Fix typo. Remove extra tab

Change-Id: Ic962e6625dda036076b1e833300dcec84861850e
diff --git a/linux/system/single.yml b/linux/system/single.yml
index 4c5228f..e2a8502 100644
--- a/linux/system/single.yml
+++ b/linux/system/single.yml
@@ -12,7 +12,7 @@
           name: root
           home: /root
       package:
-          python-msgpack:
+        python-msgpack:
           version: latest
         cloud-init:
           version: purged