Update Winget-Upgrade.ps1

Quick-Fix for bug reported in #543

Summary: with additional parameters we filter files (and ignore folders), then drill it down to PS1 files, also proactively we ignore sub-folders if such are present.

Sources/WAU/Winget-AutoUpdate/Winget-Upgrade.ps1

@@ -3,7 +3,7 @@
 #Get the Working Dir
 $Script:WorkingDir = $PSScriptRoot
 #Get Functions
-Get-ChildItem "$WorkingDir\functions" | ForEach-Object { . $_.FullName }
+Get-ChildItem "$WorkingDir\functions" -File -Filter "*.ps1" -Depth 0 | ForEach-Object { . $_.FullName }
 
 
 <# MAIN #>