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

```bash
Examining fail2ban/ng/config.sls of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
fail2ban/ng/config.sls:17
        - mode: '{{ fail2ban.mode|default("644")}}'

[206] Jinja variables should have spaces before and after: {{ var_name }}
fail2ban/ng/config.sls:42
        - mode: '{{ fail2ban.mode|default("644")}}'

[206] Jinja variables should have spaces before and after: {{ var_name }}
fail2ban/ng/config.sls:66
        - mode: '{{ fail2ban.mode|default("644")}}'

[206] Jinja variables should have spaces before and after: {{ var_name }}
fail2ban/ng/config.sls:92
        - mode: '{{ fail2ban.mode|default("644")}}'
```

saltstack-formulas/fail2ban-formula,saltstack-formulas/fail2ban-formula,saltstack-formulas/fail2ban-formula