Update horizon wsgi wrapper to the recommended one

During Rocky cycle, horizon updates the path of the wsgi wrapper
to the one recommended by Django [1]. The old path will be dropped
in the T release.

[1] https://review.openstack.org/#/c/561802/

Related-Bug: #1763204
Change-Id: Ie942518b587d193a7de55ffcc0a2848406146eb2
1 file changed