fix horizon contents path for ubuntu/binary

The static contents directory path of the openstack-dashboard
provided by Ubuntu Cloud Archive is different from RDO's.
This fixes the horizon.conf template to set the correct alias
when ubuntu+binary are specified.

Change-Id: I1b0c04cecc66b42bf764aa035e7ec24c37d805e3
Closes-Bug: #1700712

ansible/roles/horizon/templates/horizon.conf.j2

@@ -16,7 +16,11 @@ Listen {{ api_interface_address }}:{{ horizon_port }}
         Require all granted
     </Location>
 
+{% if kolla_base_distro == 'ubuntu' and kolla_install_type == 'binary' %}
+    Alias /static /var/lib/openstack-dashboard/static
+{% else %}
     Alias /static {{ python_path }}/static
+{% endif %}
     <Location "/static">
         SetHandler None
     </Location>