Fixes bug on 'Count' property of the $XMLFiles object

Error message when attempting to run:

PS C:\> Get-GPPPassword
Get-GPPPassword : Property 'Count' cannot be found on this object. Make sure that it exists.
At line:1 char:16
+ Get-GPPPassword <<<<
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Get-GPPPassword