Allow browser to store new password after change

When listening for `submit` and then removing the `autocomplete`, it is too late and the browser does not offer to store the new password. Also if the form submit is interrupted and re-triggered, the browser did not get it in my test. So my suggestion is to listen for `change` which works nicely in most of the cases. Only if the password field is filled, deleted again and then the mail input is focused and left by pressing tab, the browser re-fills the stored password. For me, this is fine.

One more issue is that the browser also offers to store credentials of other users. Should we care about that?