Remove "keystone_token_provider==uuid" from keystone.conf

it missing from [0]

[0]: https://review.openstack.org/#/c/566210/

Change-Id: I990dea52d3aa45d3d7c352c2664541799d912cdc

ansible/roles/keystone/templates/keystone.conf.j2

@@ -30,15 +30,11 @@ domain_config_dir = /etc/keystone/domains
 
 [token]
 revoke_by_id = False
-{% if keystone_token_provider == 'uuid' %}
-provider = uuid
-{% elif keystone_token_provider == 'fernet' %}
 provider = {{ keystone_token_provider }}
 expiration = {{ fernet_token_expiry }}
 
 [fernet_tokens]
 max_active_keys = {{ (groups['keystone'] | length) + 1 }}
-{% endif %}
 
 [cache]
 backend = oslo_cache.memcache_pool