fix local-path-provisioner helper image repo (#7703)

roles/kubernetes-apps/external_provisioner/local_path_provisioner/templates/local-path-storage-cm.yml.j2

@@ -56,4 +56,4 @@ data:
         spec:
           containers:
           - name: helper-pod
-            image: busybox
+            image: {% if local_path_provisioner_helper_image_repo is defined %}{{ local_path_provisioner_helper_image_repo }}:{{ local_path_provisioner_helper_image_tag }}{% else %}busybox{% endif %}

roles/kubernetes-apps/external_provisioner/local_path_provisioner/templates/local-path-storage-deployment.yml.j2

@@ -26,10 +26,6 @@ spec:
         - /etc/config/config.json
 {% if local_path_provisioner_debug|default(false) %}
         - --debug
-{% endif %}
-{% if local_path_provisioner_helper_image_repo is defined %}
-        - --helper-image
-        - {{local_path_provisioner_helper_image_repo}}:{{local_path_provisioner_helper_image_tag}}
 {% endif %}
         volumeMounts:
         - name: config-volume