Fix typos in reclass for image_layout backends

Change-Id: I259c2265b6b2fac638aa896c1ddec11814740f69
diff --git a/salt/control/cluster/openstack_telemetry_cluster.yml b/salt/control/cluster/openstack_telemetry_cluster.yml
index c215a71..594d671 100644
--- a/salt/control/cluster/openstack_telemetry_cluster.yml
+++ b/salt/control/cluster/openstack_telemetry_cluster.yml
@@ -5,7 +5,7 @@
       user_data:
         write_files:
         - content: |
-            ${salt:control:size:openstack.share:image_layout}
+            ${salt:control:size:openstack.telemetry:image_layout}
           owner: root:root
           path: /usr/share/growlvm/image-layout.yml
   salt: