[TF] Change vsrx_image to vsrx-mcp2-tf-3-nets-lo

Related-PROD: PRODX-14256
Change-Id: Ia7273a24f7b5fdc3fbeb7219a2b3f2f5bd76ab4a
diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index c61f959..d3949b6 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
+    default: vsrx-mcp2-tf-3-nets-lo
   vsrx_flavor:
     type: string
     default: oc_vsrx