Comment 4 for bug 1859491

Reviewed: https://review.opendev.org/702317
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=f9afb87b421827fae6d0bea9bfba43398c8999db
Submitter: Zuul
Branch: stable/train

commit f9afb87b421827fae6d0bea9bfba43398c8999db
Author: Emilien Macchi <email address hidden>
Date: Mon Jan 13 11:07:06 2020 -0500

    horizon: put plugins toggles in quotes

    Without quotes, it seems like Ansible "from_yaml" filter will convert
    yes to True and no to False; which is problematic in the case of Kolla
    image for Horizon where the extend_start script checks for yes/no and
    not the actual booleans.

    Putting them between quotes seems to solve the issue.

    Change-Id: Ie08726c0916c55c3d4c315b63ee341196cc2e70e
    Closes-Bug: #1859491
    (cherry picked from commit 2da9cc14bf05af369c2036c2824d3e701c807467)