Update to use locally set variable to avoid additional API Call

ZertoApiWrapper/Public/Get-ZertoUnprotectedVm.ps1

@@ -1,6 +1,6 @@
 <# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
 function Get-ZertoUnprotectedVm {
     [cmdletbinding()]
-    $uri = "virtualizationsites/{0}/vms" -f $(Get-ZertoLocalSite).siteidentifier
+    $uri = "virtualizationsites/{0}/vms" -f $script:zvmLocalInfo.siteidentifier
     Invoke-ZertoRestRequest -uri $uri
 }