password_change_done - using correct template

During the transition to all class based views an error slipped using the wrong template in `allauth.accounts.views` `PasswordResetDoneView` (currently set to use `account/password_reset.html`).
In old function based view `password_reset_done` you are using `account/password_reset_done.html` template. 

In this pull request I set it to use the correct template and that's about it :)