fix(vhosts/minimal.tmpl): fix `salt-lint` errors

```bash
Examining apache/vhosts/minimal.tmpl of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
apache/vhosts/minimal.tmpl:25
<VirtualHost {% for intf in vals.interfaces %} {{intf}}:{{ vals.port }}{% endfor -%}>
```

apache/vhosts/minimal.tmpl

     'DocumentRoot': site.get('DocumentRoot', '{0}/{1}'.format(map.wwwdir, sitename))
 } -%}
 
-<VirtualHost {% for intf in vals.interfaces %} {{intf}}:{{ vals.port }}{% endfor -%}>
+<VirtualHost {% for intf in vals.interfaces %} {{ intf }}:{{ vals.port }}{% endfor -%}>
     ServerName {{ vals.ServerName }}
     {% if site.get('ServerAlias') != False %}ServerAlias {{ vals.ServerAlias }}{% endif %}
     {% if site.get('ServerAdmin') != False %}ServerAdmin {{ vals.ServerAdmin }}{% endif %}