Fix policies ACLs

[samuelmeuli]

Q	A
Fixed Issues?	Closes #75
Patch: Bug Fix?	Yes
Minor: New Feature?	No
Major: Breaking Change?	No
Tests Added + Pass?	No
Documentation Provided	No
Any Dependency Changes?	No
License	Apache License, Version 2.0

Fixes the root model meta tag on publish instances when the user is not logged in:

• Before: <meta property="cq:pagemodel_root_url"/>
• After: <meta property="cq:pagemodel_root_url" content="/content/projectname/en.model.json">

This is fixed by assigning wcm/policies the same ACLs as to wcm/templates.

Internal issue: CQ-4283709