fix(pillar.example): fix `octal-values` violation

[myii]

• Semi-automated using https://github.com/myii/ssf-formula/pull/59
• https://travis-ci.org/myii/php-formula/builds/594703019#L208-L210

$ yamllint -s .
./pillar.example
  151:30    error    forbidden implicit octal value "0660"  (octal-values)

[saltstack-formulas-travis]

:tada: This PR is included in version 1.2.1 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: