fix(config.jinja): fix salt-lint errors

```bash
Examining fail2ban/ng/files/config.jinja of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
fail2ban/ng/files/config.jinja:13
[{{section}}]
```

fail2ban/ng/files/config.jinja

@@ -10,7 +10,7 @@
 {%- endmacro %}
 
 {%- for section, section_data in config|dictsort %}
-[{{section}}]
+[{{ section }}]
 {%- for name, value in section_data|dictsort %}
 {{- print_config(name, value) }}
 {%- endfor %}