Points to correct path for scripts

I'm not sure if this was intentional or not. But if you look at the path, there is no `template/osx/scripts`, only `template/osx/script`. Therefore the template.json located at `template/osx/packer/template.json` would have incorrect paths. Also though, I'm not sure if [L43]('https://github.com/412andrewmortimer/basebox-packer/compare/misheska:master...412andrewmortimer:osx-packer-template?expand=1#diff-4cfcc974b4b26beebccee6699359c4f7L43') needs to be plural or singular.