[TF] Update vsrx image

Updated vsrx config allows access to public via
accessible network

Related-PROD: PRODX-17734
Change-Id: I454b5cca4007be7ab8c881da33ff22362cc9812e
diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index e87501a..b5f911f 100644
--- a/de/heat-templates/top.yaml
+++ b/de/heat-templates/top.yaml
@@ -303,7 +303,7 @@
     default: 'false'
   vsrx_image:
     type: string
-    default: vsrx-mcp2-tf-3-nets-lo
+    default: mos-vsrx-acc-fl-tun
   vsrx_flavor:
     type: string
     default: oc_vsrx