added template support for automation

[P-Storm]

There was no support for a value template. With this change you can use a template in the automation.

alias: Button+ Update state
description: ""
trigger: []
condition: []
action:
  - device_id: <button+_id>
    domain: text
    entity_id: <button+_identity>
    type: set_value
    value: "{{ states('light.lamp') }}"
mode: single

[koenhendriks]

LGTM