authPrompt: Keep password entry on reset

Usually, logging in or unlocking the session is made asynchronously,
and AuthPrompt properly manages which entry is currently visible.
External code don't rely on any specific entry to be set, since it
is AuthPrompt's responsibility to select the correct one to be shown.

However, there's one specific case where AuthPrompt must preserve
the password entry: on reset. The reset code preserved whatever
entry was currently displayed, but after fe69daca, it always
changes to the username entry.

Make sure to show the password entry on reset.

!999
6 jobs for !999 with gbsneto/more-lock-screen-fixes in 7 minutes and 50 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Review
passed #591293
check_commit_log

00:00:24

passed #591295
eslint

00:01:14

passed #591294
js_check

00:00:31

 
  Build
passed #591296
build

00:05:35

 
  Test
passed #591297
test

00:00:48

passed #591298
test-pot

00:00:59