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fix(syslog_ng.sls): fix `yamllint` errors in test pillar
https://travis-ci.com/saltstack-formulas/syslog-ng-formula/builds/129135816#L210-L217:
```bash
$ yamllint -s .
./test/salt/pillar/syslog_ng.sls
4:24 warning truthy value should be one of [false, true] (truthy)
6:16 warning truthy value should be one of [false, true] (truthy)
7:17 warning truthy value should be one of [false, true] (truthy)
16:7 error wrong indentation: expected 8 but found 6 (indentation)
20:7 error wrong indentation: expected 8 but found 6 (indentation)
25:7 error wrong indentation: expected 8 but found 6 (indentation)
```
tags/v0.4.0