Revert part of a murano patch which breaks horizon

See bug for more details.

Change-Id: Ieb80b8edb122bba7cde85cb4840730ebdb31f0a9
Closes-Bug: #1659725

ansible/roles/horizon/templates/local_settings.j2

@@ -455,7 +455,7 @@ TIME_ZONE = "UTC"
 # target installation.
 
 # Path to directory containing policy.json files
-#POLICY_FILES_PATH = '/etc/openstack-dashboard'
+POLICY_FILES_PATH = '/etc/openstack-dashboard'
 
 # Map of local copy of service policy files.
 # Please insure that your identity policy file matches the one being used on