Add winget repair helper and remove winget configure --enable prerequisite

Initialize-Winget.ps1 refreshes PATH, re-registers App Installer and
falls back to the provisioned package before exiting with a Store link.
All scripts that call winget now dot-source this helper instead of
failing on a missing winget.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

powershell/Winget-Remove-BuiltInApps.ps1

@@ -1,6 +1,9 @@
 # Requires running as administrator
 # Uninstalling Windows applications via winget
 
+. (Join-Path $PSScriptRoot "Initialize-Winget.ps1")
+Initialize-Winget
+
 $Packages = @(
     "Windows Web Experience Pack",
     "Xbox",