fix(grafana.ini.jinja): fix salt-lint errors

```bash
Examining grafana/files/default/grafana.ini.jinja of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
grafana/files/default/grafana.ini.jinja:15
[{{section}}]
```

grafana/files/default/grafana.ini.jinja

@@ -12,6 +12,6 @@
 {{ render_key_value_pairs(config.get("default", {})) }}
 {% for section, cfg in config.items() %}
 {%-   if section == "default" %}{% continue %}{% endif %}
-[{{section}}]
+[{{ section }}]
 {{ render_key_value_pairs(cfg) }}
 {%  endfor %}