Remove invalid reference to Placement API

The Placement API has moved out of the Nova role and is no
longer defined in `nova_services`.

Change-Id: I7b9601334c7e4c6b075a233557669ad414556e09

ansible/roles/nova/handlers/main.yml

@@ -233,7 +233,6 @@
     - inventory_hostname in groups[item.value.group]
     - item.value.enabled | bool
     - item.key in nova_services_require_nova_conf
-    - item.key != 'placement-api'
   with_dict: "{{ nova_services }}"
   listen:
     - Restart nova-compute container