bug(picasso): Schedule entry ending before 6am is not displayed

Any schedule entry that has and end time between 0am and 5am is not shown in the picasso.
Assumption is, that any schedule entry with a start time or end time outside the picasso's view would not be displayed.

Steps to reproduce:
- Create a schedule entry in the afternoon
- Move the schedule entry such that the end time would be after midnight
- Entry is not displayed anymore

### Todo
- [x] Bug report on vuetify https://github.com/vuetifyjs/vuetify/issues/14603
- [x] Quickfix #2392
- [ ] Sustainable fix after vuetify bug is fixed

### Further comments
I had a first try to compute `firstInterval` and `intervalCount` dynamically based on startTime & endTime data from the schedule entries. Not very successful though as this behaves very unpredictable with drag & drop. Would be solution for print where schedule entries don't change dyanmically.