fix(repo.sls): fix salt-lint errors
```bash
Examining php/hhvm/repo.sls of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
php/hhvm/repo.sls:12
- name: deb http://dl.hhvm.com/{{ salt['grains.get']('os')|lower }} {{ salt['grains.get']('oscodename')}} main
```
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