Maintain remember me state on password change

Fix regression from https://gerrit.wikimedia.org/r/#/c/94614/

Ensure that when users login with "remember me" selected, they get a
new remember me token after changing their password.

Change-Id: Ibbf0d823bd5ef5304bf6ad1b67966d18dfb3580c
Merge "Maintain remember me state on password change"