Do not escape value of `enforce_password`

Fixes #82.

users/init.sls

@@ -73,7 +73,7 @@ users_{{ name }}_user:
     - password: '{{ user['password'] }}'
     {% endif -%}
     {% if 'enforce_password' in user -%}
-    - enforce_password: '{{ user['enforce_password'] }}'
+    - enforce_password: {{ user['enforce_password'] }}
     {% endif -%}
     {% if user.get('system', False) -%}
     - system: True