Fix Package name

It fixes the error
```
Error: Execution of '/usr/sbin/chown -R mats:staff /Applications/TheUnarchiver-3.9.1.app' returned 1: chown: /Applications/TheUnarchiver-3.9.1.app: No such file or directory
Error: /Stage[main]/Unarchiver/Package[TheUnarchiver-3.9.1]/ensure: change from absent to present failed: Execution of '/usr/sbin/chown -R mats:staff /Applications/TheUnarchiver-3.9.1.app' returned 1: chown: /Applications/TheUnarchiver-3.9.1.app: No such file or directory
```