Update thinmanager_traversal_upload2.rb

Author: h4x-x0r

modules/auxiliary/admin/networking/thinmanager_traversal_upload2.rb

@@ -55,7 +55,7 @@ def check
       connect
     rescue Rex::ConnectionTimeout
       print_error("Connection to #{datastore['RHOSTS']}:#{datastore['RPORT']} failed.")
-      return CheckCode::Unreachable
+      return Exploit::CheckCode::Unknown
     end
 
     vprint_status('Sending handshake...')