remove ambiguous unicode character from powershell script

files/restricted-group-check.ps1

@@ -72,7 +72,7 @@ foreach ($gpoGuid in $gpoLinks.Keys) {
         $gpo = Get-GPO -Guid $gpoGuid -ErrorAction Stop
     }
     catch {
-        Write-Warning "Unable to retrieve GPO $gpoGuid – skipping."
+        Write-Warning "Unable to retrieve GPO $gpoGuid - skipping."
         continue
     }
     Write-Host "GPO: $($gpo.DisplayName)"