Remove missing vars

ansible/pre-deploy.yml

@@ -49,7 +49,5 @@
         config:
           ADMIN_KEY: "{{ alerta_admin_key }}"
           ADMIN_PASSWORD: "{{ alerta_admin_passwd }}"
-          AUTH_PROVIDER: "{{ auth_provider }}"
-          AUTH_REQUIRED: "{{ auth_required }}"
           DATABASE_NAME: "{{ db_name }}"
           DATABASE_URL: "postgresql://{{ db_user }}:{{ db_passwd }}@{{ db_loc }}/{{ db_name }}"