Update mma_backdoor_upload.rb

Author: shipcod3

modules/exploits/multi/http/mma_backdoor_upload.rb

@@ -89,7 +89,7 @@ def exploit
         fail_with(Failure::UnexpectedReply, "#{peer} - Unable to deploy payload, server returned #{res.code}")
       end
     else
-      fail_with(Failure::Unknown, 'ERROR')
+      fail_with(Failure::Unknown, 'Connection Timed Out')
     end
 
     send_request_cgi({