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Fix rapid7#4246

... so it will automatically close the ticket.

Author: wchen-r7

modules/exploits/windows/iis/msadc.rb

@@ -332,7 +332,7 @@ def exploit
 
       # Save these file names for later deletion
       @exe_cmd_copy = exe_fname
-      @exe_payload = stager_instance.payload_exe
+      @exe_payload = stager_instance.payload_exe # Grab this info from CmdStagerTFTP
 
       # Just for good measure, we'll make a quick, direct request for the payload
       # Using the "start" method doesn't seem to make iis very happy :(