fix(init.sls): fix `salt-lint` errors

```bash
Examining users/init.sls of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
users/init.sls:176
    - expire: {{ (user['expire'] / 86400) | int}}

[206] Jinja variables should have spaces before and after: {{ var_name }}
users/init.sls:202
      - {{optional_group}}
```

users/init.sls

@@ -173,7 +173,7 @@ users_{{ name }}_user:
         {% elif grains['kernel'] == 'Linux' and
             user['expire'] > 84006 %}
         {# 2932896 days since epoch equals 9999-12-31 #}
-    - expire: {{ (user['expire'] / 86400) | int}}
+    - expire: {{ (user['expire'] / 86400) | int }}
         {% else %}
     - expire: {{ user['expire'] }}
         {% endif %}
@@ -199,7 +199,7 @@ users_{{ name }}_user:
     {% if 'optional_groups' in user %}
     - optional_groups:
       {% for optional_group in user['optional_groups'] -%}
-      - {{optional_group}}
+      - {{ optional_group }}
       {% endfor %}
     {% endif %}
     - require: