Fix xcopy command to handle PPKG filenames with spaces

Adds proper quoting around file paths in the xcopy invocation to support PPKG filenames containing spaces. Without quoted paths, xcopy fails when filenames include whitespace characters.

FFUDevelopment/WinPEDeployFFUFiles/ApplyFFU.ps1

@@ -1464,7 +1464,8 @@ If ($PPKGFileToInstall) {
         }
         WriteLog "Copying $PPKGFileToInstall to $USBDrive"
         Write-Host "Copying $PPKGFileToInstall to $USBDrive"
-        Invoke-process xcopy.exe "$PPKGFileToInstall $USBDrive"
+        # Quote paths to handle PPKG filenames with spaces
+        Invoke-process xcopy.exe """$PPKGFileToInstall"" ""$USBDrive"""
         WriteLog "Copying $PPKGFileToInstall to $USBDrive succeeded"
         Write-Host "Copying $PPKGFileToInstall to $USBDrive succeeded"
     }