Update connection to work with expired token

ZertoApiWrapper/Private/Invoke-ZertoRestRequest.ps1

@@ -15,19 +15,14 @@ function Invoke-ZertoRestRequest {
         Write-Error -Message "Zerto Connection does not Exist. Please run Connect-ZertoServer first to establish a connection"
         break
     }
-    if ( Test-Path variable:script:zvmHeaders ) {
-        $headers = $script:zvmHeaders
-    } else {
-        $headers = $null
-    }
     if ( (Test-Path variable:script:zvmHeaders) -and $([datetime]$script:zvmLastAction).addMinutes(30) -lt $(get-date) ) {
-        Write-Error -Message "Authorization Token has Expired or Does not exist in Env variables. Please re-authorize to the Zerto Virtual Manager"
+        Write-Error -Message "Authorization Token has Expired. Please re-authorize to the Zerto Virtual Manager"
         break
     } else {
         $submittedURI = "https://{0}:{1}/{2}/{3}" -f $script:zvmServer, $script:zvmPort, $apiVersion, $uri
         try {
             $script:zvmLastAction = (get-date).Ticks
-            $apiRequestResults = Invoke-RestMethod -Uri $submittedURI -Headers $headers -Method $method -Body $body -ContentType $contentType -Credential $credential -SkipCertificateCheck -ResponseHeadersVariable responseHeaders -TimeoutSec 100
+            $apiRequestResults = Invoke-RestMethod -Uri $submittedURI -Headers $script:zvmHeaders -Method $method -Body $body -ContentType $contentType -Credential $credential -SkipCertificateCheck -ResponseHeadersVariable responseHeaders -TimeoutSec 100
         } catch {
             Write-Error -ErrorRecord $_ -ErrorAction $callerErrorActionPreference
         }