Fix morning questionnaire notification

It will not beep, not flash, not vibrate (since by default it appears at
5am).

Also removed the custom sound for notifications, which was only working
when not asked to beep. I think this would be better as a full feature
where the user can choose his own notification sound, rather than a
half-baked one.
Does it work on your phone? On mine it will only play the custom sound for the morning questionnaire (before this PR).