Not setting the branch as image_tag helm-flag in voltha-patch-test job

Change-Id: If8673be595662b23dd67f256b1ae37cca554d67a
diff --git a/jjb/voltha-e2e.yaml b/jjb/voltha-e2e.yaml
index 3c02aad..fd85c3b 100644
--- a/jjb/voltha-e2e.yaml
+++ b/jjb/voltha-e2e.yaml
@@ -164,7 +164,7 @@
 - job-template:
     id: 'voltha-patch-test'
     name: 'verify_{project}_sanity-test'
-    extra-helm-flags: '--set defaults.image_tag=$GERRIT_BRANCH'
+    extra-helm-flags: ''
 
     description: |
       <!-- Managed by Jenkins Job Builder -->