assignment to undeclared variable val

In lufi-down.js, val is never declared when we're trying to retrieve the value of the password, throwing an uncaught error.

I suggest to just use $('#file_pwd').val(); directly in the window.ws.send message without using a variable at all. (Or if you really want a variable, just add a const/let/var keyword before initializing it)

The error happens lines 58, 176 and 202.

Thanks!