(GH-957) Skip Get-WebFileName When FTP

Do not attempt to get the original file name over http when the url is
FTP.

src/chocolatey.resources/helpers/functions/Get-WebFileName.ps1

@@ -74,7 +74,6 @@ param(
 
   Write-Debug "Running 'Get-WebFileName' to determine name with url:'$url', defaultName:'$defaultName'";
 
-
   $originalFileName = $defaultName
   $fileName = $null
 
@@ -95,6 +94,11 @@ param(
     #continue on
   }
 
+  if ($url.StartsWith('ftp')) {
+    Write-Debug "Url is FTP, using default name."
+    return $originalFileName
+  }
+
   $request = [System.Net.HttpWebRequest]::Create($url)
   if ($request -eq $null) {
     Write-Debug "Request was null, using default name."