Show FSI HUN for 60 more seconds after update

Fixes: 269781055

Test: show forever
- Send FSI HUN (permission GRANTED)
- Send any HUN and expand it
- Send any HUN, tap reply button to focus input

Test: show 60s
- Send FSI HUN (permission DENIED)
- Update FSI HUN (permission DENIED) (shows for 60s since update)

Test: show 5s
- Send non-FSI HUN
- Send FSI hun after demotion

Test: call via duo, hang up => HUN hides (no regression)

Change-Id: Id30dbfa78c6973f0f019207a5f44151363d6c3aa