(maint) Fix Install-ChocolateyZipPackage outputs

[Ana06]

Install-ChocolateyZipPackage calls Get-ChocolateyUnzip which outputs
the passed in $destination. Consequently, Install-ChocolateyZipPackage
outputs the passed in $unzipLocation.

[CLAassistant]

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[Ana06]

Is it needed to sign the CLA for this? I think this can be considered a trivial change.

Ensure you have signed the Contributor License Agreement (CLA) - without this we are not able to take contributions that are not trivial.